Gas saving ideas from Edmonds!
05-07-2006, 04:18 PM
#1
Member
Thread Starter
Join Date: 04-20-2006
Location: Columbia, MD
Posts: 63
Gas saving ideas from Edmonds!
We Test the Tips
What Really Saves Gas? And How Much?
By Philip Reed and Mike Hudson
With gas prices so high, the media is awash with lists of gas-saving tips. Well how's this for a tip? If you listen to us, you can see hybrid-type savings without having to buy a new car.
By changing your driving habits you can improve fuel economy up to 37 percent right away (depending on how you drive). Combine several tips and perform routine maintenance and you will save real dollars, not just pennies.
Test #1 Aggressive Driving vs. Moderate Driving
Result: Major savings potential
The Cold Hard Facts: Up to 37 percent savings, average savings of 31 percent
Recommendation: Stop driving like a maniac.
Aggressive vs. Moderate Driving: read the entire test
Test #2 Lower Speeds Saves Gas
Result: Substantial savings on a long trip
Cold Hard Facts: Up to 14 percent savings, average savings of 12 percent
Recommendation: Drive the speed limit.
Lower Speeds Saves Gas: Read the entire test
Test #3 Use Cruise Control
Result: Surprisingly effective way to save gas
Cold Hard Facts: Up to 14-percent savings, average savings of 7 percent
Recommendation: If you've got it, use it.
Cruise Control: Read the entire test
Test #4 A/C On, Windows Up vs. A/C Off, Windows Down
Result: Nice in theory; not true in practice
Cold Hard Facts: No measurable difference (unless you open the sunroof, too!)
Recommendation: Please, make yourself comfortable.
Air Conditioner: Read the entire test
Test #5 Check Your Tire Pressure
Result: Important for safety and to reduce tire wear
Cold Hard Facts: No measurable effect on the vehicles we tested
Recommendation: Check your tire pressure often but don't expect a big savings.
Tire pressure: Read the entire test
Test #6 Avoid Excessive Idling
Result: More important than we assumed
Cold Hard Facts: Avoiding excessive idling can save up to 19 percent
Recommendation: Stopping longer than a minute? Shut 'er down.
Excessive idling: Read the entire test
The Tests
Our results are based on two separate fuel testing sessions. On each occasion we took two cars from the Edmunds.com long-term fleet and drove on a 56-mile test loop. Our route circled Owens Lake near Lone Pine, California, at the foot of Mount Whitney, the tallest mountain in the lower 48 states. We chose the route because it was so deserted we could vary our speed and driving style without interfering with the flow of traffic. The only other cars we saw on the route were a caravan of test vehicles from Mercedes-Benz. We drove the loops back-to-back to ensure that we were comparing similar wind and temperatures. We logged our results and later put them on a spreadsheet where the results were averaged.
Test #1: Aggressive vs. Moderate Driving
This is gonna hurt. Our tests showed that the most significant way to save gas is: you. And we're talking massive fuel economy gains. Think you need a hybrid? Chances are you've got hybrid-style mileage in your gas pedal foot. Don't mash the gas when you start up. Take the long view of the road and brake easy. This tip alone can save you unbelievable amounts of gas. If you slowed your 0-to-60-mph acceleration time down from your current 10 seconds to a more normal city pace of 15 seconds, you'll feel the savings immediately.
Method: We conducted this test four times. The first time we did the full 55-mile loop once by accelerating aggressively 15 times at 3/4-throttle from zero to a cruising speed of 75 mph. We also applied the brakes hard to come to a full stop. Then, we drove the second loop by accelerating moderately 15 times at 1/4-throttle to a cruising speed of 70 mph. We braked lightly to a full stop. In the second set of tests we drove 25 miles making 25 rapid accelerations to 65 mph at 3/4-throttle. After 1 minute of cruising we braked hard and repeated the cycle up to 65 mph. We then drove the same distance making 25 moderation accelerations to 60 mph at 1/4-throttle. After 1 minute of cruising we applied the brakes easily and came to a full stop.
Test #2 Lower Speeds Saves Gas
Remember a thing called the speed limit? On most highways it is either 65 or 70 mph. How fast are the cars and trucks around you going? From 75 mph to 90 mph. These people are wasting a lot of gas for the chance to get there a little earlier. Factor in safety concerns and a speeding ticket once or twice a year and going fast is a costly proposition.
Method: This test was simple. For 50 miles we drove with the cruise control set at 65 mph. Then, for another 50-mile stretch we drove with cruise set at 75 mph. We repeated this test going in the opposite direction. It is amazing how obvious the difference in gas mileage was. Just think what would have happened if we had slowed down to 60 mph. The only problem is with impatient drivers behind you. One driver became so irate that he tried to run our editor off the road. Still, if you are pinched by gas prices. Leave a little early and drive the speed limit (in the slow lane).
Test #3 Use Cruise Control
Using cruise control is a bit of gas-saving advice frequently on tips lists. We have always agreed with this tip in theory but we hadn't expected such significant results. First, it smoothes out the driver's accelerator input by preventing nervous "surging." Second, it makes the driver take the long view of the road rather than reacting to every change in the traffic around them.
Method: We did this test twice with four different cars each time driving the 55-mile loop. The first time we set cruise control to 70 mph. The second time, with the cruise control off, we varied our speed between 65 mph and 75 mph. We tried to mimic the driving style of a person who is in moderate freeway traffic.
One thing that's important to note: if you are in a mountainous area you should turn off cruise. It will try to keep you up to the speed you've set and will use a lot of extra gas downshifting to lower gears to accomplish this.
Test #4 A/C On, Windows Up vs. A/C Off, Windows Down
This has got to take you back to the days with the family on vacation. Dad says, "Turn the A/C off! It wastes gas!" And Mom says, "We can't roll the windows down or everyone on the highway will think we can't afford A/C." And you're in the back roasting, hoping someone will win the argument so you can cool off.
Well, family psychology aside, if dads are still saying this, they aren't necessarily right. While the A/C compressor does pull power from the engine wasting some gas, the effect appears to be fairly minimal in modern cars. And putting the windows down tends to increase drag on most cars, canceling out any measurable gain from turning the A/C off. But this one depends on the model you're driving. When we opened the sunroof in our SUV, the mileage did decrease even with the A/C off. Still, in our experience, it's not worth the argument because you won't save a lot of gas either way. So just do what's comfortable.
Method: We drove the full 55 mile-loop in two cars at equal speeds both times — 65 mph. The first loop we drove with the A/C on and the windows up. The second loop we drove with the A/C off and windows down. In the second test we drove 20-mile loops. This was far enough to see our gas mileage level off and remain steady on the computer trip meter.
Test #5: Check Your Tire Pressure
No matter how many times drivers hear about the importance of tire pressure, most of them don't do anything about it. They probably don't like squatting beside their car in a busy gas station with fumes swirling around them. But is it important? The answer is yes, for a number of reasons. Properly inflated tires are less likely to fail at high speeds. They wear more evenly and, yes, they deliver better gas mileage. How much? In this test we saw a modest difference in two of the cars. It might have been more dramatic with different tires on different cars. Experts swear by it; we couldn't really document it. And we wound up wondering if tire technology, like the design in other areas of the car, had improved.
Eventually, we concluded that each set of tires is different and every vehicle is different. We recommend that you do your own tests to see what inflation setting gives you the best fuel economy.
Method: We drove the 55-mile test loop four times at 60 mph — twice with tires at or above proper inflation. Once, we did the test with the tires 5 psi below the pressure recommended by the manufacturer. Since this produced very little difference we enlarged the gap and under inflated the tires by 8 psi. We felt that it was important to make sure the tires were inflated to the recommended level or above.
Test #6 Avoid Excessive Idling
If you turn off a light bulb as you leave the room you'll save electricity. If you turn off your car you will save gas. Obviously. But related questions are more difficult to answer. If you're only stopping for only a minute, is it better to shut off the engine or keep it idling? Should I shut off the engine in traffic? How much gas will this save? What rule of thumb do I use when trying to save gas this way?
Method: We took two cars and drove a 10-mile route stopping 10 times for two minutes. We shut down the car each time. Then we drove the same route at the same speed and let the car idle for two minutes.
Conclusions
The good news is that you can drastically improve your gas mileage. The caveat is that you have to change your driving habits. If you are willing to change, you'll find many related benefits too: no speeding tickets, greater safety, reduced stress and lower repair bills for tires and brake pads. In the long run this will save you money. And who knows? You might like the new you.
What Really Saves Gas? And How Much?
By Philip Reed and Mike Hudson
With gas prices so high, the media is awash with lists of gas-saving tips. Well how's this for a tip? If you listen to us, you can see hybrid-type savings without having to buy a new car.
By changing your driving habits you can improve fuel economy up to 37 percent right away (depending on how you drive). Combine several tips and perform routine maintenance and you will save real dollars, not just pennies.
Test #1 Aggressive Driving vs. Moderate Driving
Result: Major savings potential
The Cold Hard Facts: Up to 37 percent savings, average savings of 31 percent
Recommendation: Stop driving like a maniac.
Aggressive vs. Moderate Driving: read the entire test
Test #2 Lower Speeds Saves Gas
Result: Substantial savings on a long trip
Cold Hard Facts: Up to 14 percent savings, average savings of 12 percent
Recommendation: Drive the speed limit.
Lower Speeds Saves Gas: Read the entire test
Test #3 Use Cruise Control
Result: Surprisingly effective way to save gas
Cold Hard Facts: Up to 14-percent savings, average savings of 7 percent
Recommendation: If you've got it, use it.
Cruise Control: Read the entire test
Test #4 A/C On, Windows Up vs. A/C Off, Windows Down
Result: Nice in theory; not true in practice
Cold Hard Facts: No measurable difference (unless you open the sunroof, too!)
Recommendation: Please, make yourself comfortable.
Air Conditioner: Read the entire test
Test #5 Check Your Tire Pressure
Result: Important for safety and to reduce tire wear
Cold Hard Facts: No measurable effect on the vehicles we tested
Recommendation: Check your tire pressure often but don't expect a big savings.
Tire pressure: Read the entire test
Test #6 Avoid Excessive Idling
Result: More important than we assumed
Cold Hard Facts: Avoiding excessive idling can save up to 19 percent
Recommendation: Stopping longer than a minute? Shut 'er down.
Excessive idling: Read the entire test
The Tests
Our results are based on two separate fuel testing sessions. On each occasion we took two cars from the Edmunds.com long-term fleet and drove on a 56-mile test loop. Our route circled Owens Lake near Lone Pine, California, at the foot of Mount Whitney, the tallest mountain in the lower 48 states. We chose the route because it was so deserted we could vary our speed and driving style without interfering with the flow of traffic. The only other cars we saw on the route were a caravan of test vehicles from Mercedes-Benz. We drove the loops back-to-back to ensure that we were comparing similar wind and temperatures. We logged our results and later put them on a spreadsheet where the results were averaged.
Test #1: Aggressive vs. Moderate Driving
This is gonna hurt. Our tests showed that the most significant way to save gas is: you. And we're talking massive fuel economy gains. Think you need a hybrid? Chances are you've got hybrid-style mileage in your gas pedal foot. Don't mash the gas when you start up. Take the long view of the road and brake easy. This tip alone can save you unbelievable amounts of gas. If you slowed your 0-to-60-mph acceleration time down from your current 10 seconds to a more normal city pace of 15 seconds, you'll feel the savings immediately.
Method: We conducted this test four times. The first time we did the full 55-mile loop once by accelerating aggressively 15 times at 3/4-throttle from zero to a cruising speed of 75 mph. We also applied the brakes hard to come to a full stop. Then, we drove the second loop by accelerating moderately 15 times at 1/4-throttle to a cruising speed of 70 mph. We braked lightly to a full stop. In the second set of tests we drove 25 miles making 25 rapid accelerations to 65 mph at 3/4-throttle. After 1 minute of cruising we braked hard and repeated the cycle up to 65 mph. We then drove the same distance making 25 moderation accelerations to 60 mph at 1/4-throttle. After 1 minute of cruising we applied the brakes easily and came to a full stop.
Test #2 Lower Speeds Saves Gas
Remember a thing called the speed limit? On most highways it is either 65 or 70 mph. How fast are the cars and trucks around you going? From 75 mph to 90 mph. These people are wasting a lot of gas for the chance to get there a little earlier. Factor in safety concerns and a speeding ticket once or twice a year and going fast is a costly proposition.
Method: This test was simple. For 50 miles we drove with the cruise control set at 65 mph. Then, for another 50-mile stretch we drove with cruise set at 75 mph. We repeated this test going in the opposite direction. It is amazing how obvious the difference in gas mileage was. Just think what would have happened if we had slowed down to 60 mph. The only problem is with impatient drivers behind you. One driver became so irate that he tried to run our editor off the road. Still, if you are pinched by gas prices. Leave a little early and drive the speed limit (in the slow lane).
Test #3 Use Cruise Control
Using cruise control is a bit of gas-saving advice frequently on tips lists. We have always agreed with this tip in theory but we hadn't expected such significant results. First, it smoothes out the driver's accelerator input by preventing nervous "surging." Second, it makes the driver take the long view of the road rather than reacting to every change in the traffic around them.
Method: We did this test twice with four different cars each time driving the 55-mile loop. The first time we set cruise control to 70 mph. The second time, with the cruise control off, we varied our speed between 65 mph and 75 mph. We tried to mimic the driving style of a person who is in moderate freeway traffic.
One thing that's important to note: if you are in a mountainous area you should turn off cruise. It will try to keep you up to the speed you've set and will use a lot of extra gas downshifting to lower gears to accomplish this.
Test #4 A/C On, Windows Up vs. A/C Off, Windows Down
This has got to take you back to the days with the family on vacation. Dad says, "Turn the A/C off! It wastes gas!" And Mom says, "We can't roll the windows down or everyone on the highway will think we can't afford A/C." And you're in the back roasting, hoping someone will win the argument so you can cool off.
Well, family psychology aside, if dads are still saying this, they aren't necessarily right. While the A/C compressor does pull power from the engine wasting some gas, the effect appears to be fairly minimal in modern cars. And putting the windows down tends to increase drag on most cars, canceling out any measurable gain from turning the A/C off. But this one depends on the model you're driving. When we opened the sunroof in our SUV, the mileage did decrease even with the A/C off. Still, in our experience, it's not worth the argument because you won't save a lot of gas either way. So just do what's comfortable.
Method: We drove the full 55 mile-loop in two cars at equal speeds both times — 65 mph. The first loop we drove with the A/C on and the windows up. The second loop we drove with the A/C off and windows down. In the second test we drove 20-mile loops. This was far enough to see our gas mileage level off and remain steady on the computer trip meter.
Test #5: Check Your Tire Pressure
No matter how many times drivers hear about the importance of tire pressure, most of them don't do anything about it. They probably don't like squatting beside their car in a busy gas station with fumes swirling around them. But is it important? The answer is yes, for a number of reasons. Properly inflated tires are less likely to fail at high speeds. They wear more evenly and, yes, they deliver better gas mileage. How much? In this test we saw a modest difference in two of the cars. It might have been more dramatic with different tires on different cars. Experts swear by it; we couldn't really document it. And we wound up wondering if tire technology, like the design in other areas of the car, had improved.
Eventually, we concluded that each set of tires is different and every vehicle is different. We recommend that you do your own tests to see what inflation setting gives you the best fuel economy.
Method: We drove the 55-mile test loop four times at 60 mph — twice with tires at or above proper inflation. Once, we did the test with the tires 5 psi below the pressure recommended by the manufacturer. Since this produced very little difference we enlarged the gap and under inflated the tires by 8 psi. We felt that it was important to make sure the tires were inflated to the recommended level or above.
Test #6 Avoid Excessive Idling
If you turn off a light bulb as you leave the room you'll save electricity. If you turn off your car you will save gas. Obviously. But related questions are more difficult to answer. If you're only stopping for only a minute, is it better to shut off the engine or keep it idling? Should I shut off the engine in traffic? How much gas will this save? What rule of thumb do I use when trying to save gas this way?
Method: We took two cars and drove a 10-mile route stopping 10 times for two minutes. We shut down the car each time. Then we drove the same route at the same speed and let the car idle for two minutes.
Conclusions
The good news is that you can drastically improve your gas mileage. The caveat is that you have to change your driving habits. If you are willing to change, you'll find many related benefits too: no speeding tickets, greater safety, reduced stress and lower repair bills for tires and brake pads. In the long run this will save you money. And who knows? You might like the new you.
05-07-2006, 04:27 PM
#2
Senior Member
Join Date: 04-30-2006
Location: Maryland Heights, MO
Posts: 9,149
Thanks for the great info!
I knew a couple, or at least thought I knew.
The tip I thought was the most interesting was A/C vs. 4/80 (the older crowd will understand this reference
). And also the tip about the sunroof.
I wonder if using the sunroof vent makes as substantial difference?
I knew a couple, or at least thought I knew.
The tip I thought was the most interesting was A/C vs. 4/80 (the older crowd will understand this reference
). And also the tip about the sunroof.I wonder if using the sunroof vent makes as substantial difference?
05-07-2006, 05:17 PM
#4
Deceased
Join Date: 10-03-2005
Location: Sachse, TX NE Dallas
Posts: 2,351
i buy a car for fun and not for gas savings
if i wanted that i would have bought some sort of small vehicle w a turbo diesel in it
hard to find one that doesnt get in the 40s around town and 50+ on the highway and since it is a turbo theyt still haul
we are talking 20 to 21 versus 22 to 23
i drive average of 350 miles a week
350/20= 17.5 gallons X 2.95= $51.62
350/23= 15.2 gallons X 2.95= $44.84
$6.78 a week savings X lets say 50 weeks= $339
so it makes a car payment for you in a whole year
for that $6.78 a week you drive like a slug turtle w 4 broken legs and i drive circles around you every block having fun and smiling as i drive by while u baby it leaving stops, drive speed limit and drudging around.
Not me
i will take the fun
i drive my car like a sports car enthusiast and i doubt seriously i will ever stop.
if i wanted that i would have bought some sort of small vehicle w a turbo diesel in it
hard to find one that doesnt get in the 40s around town and 50+ on the highway and since it is a turbo theyt still haul
we are talking 20 to 21 versus 22 to 23
i drive average of 350 miles a week
350/20= 17.5 gallons X 2.95= $51.62
350/23= 15.2 gallons X 2.95= $44.84
$6.78 a week savings X lets say 50 weeks= $339
so it makes a car payment for you in a whole year
for that $6.78 a week you drive like a slug turtle w 4 broken legs and i drive circles around you every block having fun and smiling as i drive by while u baby it leaving stops, drive speed limit and drudging around.
Not me
i will take the fun
i drive my car like a sports car enthusiast and i doubt seriously i will ever stop.
05-07-2006, 06:52 PM
#6
Senior Member
Join Date: 10-19-2005
Location: Miami
Posts: 20,687
Originally Posted by courthousedeb
Interesting info...thanks for sharing. I understand the 4/80 method as this is the first car in years that I've had that actually had air conditioning that worked. LOL
Don't see how I lived w/o the a/c, especially on rainy days.
05-07-2006, 08:24 PM
#7
Senior Member
Join Date: 04-22-2006
Location: Cleveland, TN
Posts: 129
[QUOTE=cj krause].........for that $6.78 a week you drive like a slug turtle w 4 broken legs and i drive circles around you every block having fun and smiling as i drive by while u baby it leaving stops, drive speed limit and drudging around......QUOTE]
Go CJ !!!
Go CJ !!!
05-07-2006, 08:38 PM
#8
Member
Thread Starter
Join Date: 04-20-2006
Location: Columbia, MD
Posts: 63
Originally Posted by cj krause
i buy a car for fun and not for gas savings
if i wanted that i would have bought some sort of small vehicle w a turbo diesel in it
hard to find one that doesnt get in the 40s around town and 50+ on the highway and since it is a turbo theyt still haul
we are talking 20 to 21 versus 22 to 23
i drive average of 350 miles a week
350/20= 17.5 gallons X 2.95= $51.62
350/23= 15.2 gallons X 2.95= $44.84
$6.78 a week savings X lets say 50 weeks= $339
so it makes a car payment for you in a whole year
for that $6.78 a week you drive like a slug turtle w 4 broken legs and i drive circles around you every block having fun and smiling as i drive by while u baby it leaving stops, drive speed limit and drudging around.
Not me
i will take the fun
i drive my car like a sports car enthusiast and i doubt seriously i will ever stop.
if i wanted that i would have bought some sort of small vehicle w a turbo diesel in it
hard to find one that doesnt get in the 40s around town and 50+ on the highway and since it is a turbo theyt still haul
we are talking 20 to 21 versus 22 to 23
i drive average of 350 miles a week
350/20= 17.5 gallons X 2.95= $51.62
350/23= 15.2 gallons X 2.95= $44.84
$6.78 a week savings X lets say 50 weeks= $339
so it makes a car payment for you in a whole year
for that $6.78 a week you drive like a slug turtle w 4 broken legs and i drive circles around you every block having fun and smiling as i drive by while u baby it leaving stops, drive speed limit and drudging around.
Not me
i will take the fun
i drive my car like a sports car enthusiast and i doubt seriously i will ever stop.
Im sure Corvettes, Mustangs, H2s, Lotus, Lamborghini's, and so forth COULD be much more fun to DRIVE. Doesn't mean that you would run out and buy one. The HHR does great on gas so youre able to push a little more.
Using your numbers though for everyone. Lets say by the end of the year based on decent projections. Some retards let gas get to $5 a gallon.
F'in sucks...here you go:
350/20= 17.5 gallons X $5.00 = $87.50
350/27.4(with a 37% gas savings increase)= 12.77 gallons X $5.00 = $63.85
Difference of 23.65 x 52 weeks in a year = $1229.8
Do the math with any price of gas you want: Subsitute (G) with price
Drive like a lead foot (R)etard - 350/20 = 17.5 X G = R
Drive like a (T)urtle - 350/27.4 = 12.77 X G = T
(R) - (T) = (D)ifference
(D)ifference X (52) weeks in a year = (S)avings in one year.
Even if I used CJs gas numbers for today:
350/20= 17.5 gallons X 2.95= $51.62
350/27.4= 12.77 gallons X 2.95= $37.67
13.95 difference X 52 = $725.00 every year in gas, that you could have saved in a year for other things.......I would rather have something else...Not everyone has money to burn like most retirees :)
05-07-2006, 09:53 PM
#9
Senior Member
Join Date: 10-19-2005
Location: Miami
Posts: 20,687
Originally Posted by CheckSando
Not everyone has money to burn like most retirees :)
I have noticed that doing 85 mph instead of 75 mph on the turnpike eats a lot more gas.
05-07-2006, 10:17 PM
#10
Deceased
Join Date: 10-03-2005
Location: Sachse, TX NE Dallas
Posts: 2,351
Originally Posted by CheckSando
F'in sucks...here you go:
Im sure Corvettes, Mustangs, H2s, Lotus, Lamborghini's, and so forth COULD be much more fun to DRIVE
Im sure Corvettes, Mustangs, H2s, Lotus, Lamborghini's, and so forth COULD be much more fun to DRIVE
i could save the other $50,000 to $150,000 by buying what i have now and the cash i saved would buy 10,000 to 30,000 gallons of gasoline and drive for quite a bit of the rest of my life with what i saved. 200,000 to 600,000 miles in $5 gas would be nice and if it stays at $4 or even $3 cause no one knows what will happen for sure then i have 250,000 to 750,000 miles at $4 gas and so on and so on. so i still get decent mileage and have fun.
i am and have been ready for $5 a gallon gas and i started driving and it was18cents a gallon,,,, yes 18 cents a gallon and now $5.
i was in GErmany in 97 and it was already over $4 a gallon then.
and speak for yourself when you talk about retirees, cause i am not retired and work daily for a living
remember the words from the most knoweldeable of all coaches of the bad news bears
Never Assume anything
you do alot of assuming for me and you dont even know me,,, i havent assumed anything about you,,,, well maybe i have now
and please dont assume it wasnt my first pick,,,, it was for what i can afford,,,,i have wanted one since i saw it at Auto Show in Motion
OH and 1 more thing, i wouldnt own a slowstang if they gave me one,,,, its a FORD. Now maybe the new Camaro for sure.
