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Fuel Economy - Hypermiling Dedicated to discussions on fuel economy improvements and related modifications.

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Old 03-22-2014, 12:42 AM   #41
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I've gotten down to 20mpg this winter. Mostly due to the amount of idle time in the morning so I don't have to freeze in the negative 20 degree weather. But I usually get 26-28 here in Cleveland, and most of my driving in highway, 60-65 mph. In the cold the air much denser. Denser air means the engine will take in more. More air, more gas to keep the proper ratio. In the summer, ill 30 mpg, maybe 32 if I'm Careful
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Old 03-24-2014, 02:35 AM   #42
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You were driving down hill on the way over and up hill on the way back.

I'll see similar mpg fluctuations. I'll drive north on I-95 through central Florida and will see 31 mpg, but on the way south, the mpg drops?
Lar, funny you mentioned it. I was actually going up in altitude on the way to get the batteries and down on the way back. Figure THAT one out.

Can't wait for warmer weather. I have to say though, overall, my gas mileage is significantly higher than when I first got the HHR.
Tire pressure, air filter and MAF cleaning (I think) helped. I'll switch over to full synthetic at the next oil change and perhaps new plugs, too.
That may be good for a mile or two. Then that'll be that.

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Old 11-03-2017, 12:14 AM   #43
 
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economy drop off in winter

This can be caused by the winter fuel blend also. I notice in both my vehicles that in October the gas mileage drops off by 2-3 mpg. Then comes back up in March/April when summer fuel blends are back.
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Old 11-03-2017, 09:00 AM   #44
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If you use your defroster the A/C is running.
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Old 11-03-2017, 09:43 AM   #45
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Using the remote start and idling to warm up will also use up the fuel.
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Old 11-03-2017, 09:45 AM   #46
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Winter can be hard on mpgs for a few reasons. Idling/warmup will use some gas, whatever they've done with the fuel, and the cooler air is denser. In order to maintain stoichiometry the car has to squirt in more fuel, due to the denser air. And, as mentioned before, running the defroster does engage the a/c compressor, to dry the air.
In addition to the idle warmup, even if you warm up while driving, it'll still take longer to get up to temp, so it isn't as efficient for a bit there.

I have a 30 mile (one way) highway commute, so my economy doesn't seem to take as much of a hit... probably because the car has plenty of time to come up to temp, and spends most of the trip at a good operating temperature where it's happy.
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Old 11-04-2017, 11:30 AM   #47
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Winter can be hard on mpgs for a few reasons. Idling/warmup will use some gas, whatever they've done with the fuel, and the cooler air is denser. In order to maintain stoichiometry the car has to squirt in more fuel, due to the denser air. And, as mentioned before, running the defroster does engage the a/c compressor, to dry the air.
In addition to the idle warmup, even if you warm up while driving, it'll still take longer to get up to temp, so it isn't as efficient for a bit there.

I have a 30 mile (one way) highway commute, so my economy doesn't seem to take as much of a hit... probably because the car has plenty of time to come up to temp, and spends most of the trip at a good operating temperature where it's happy.
I don't understand the start/idle to warm up/drive mindset. Of course, If I lived where ice and snow piled up on my car overnight, I probably would.
The first thing I noticed last winter when I got my HHR is that it warms up FAST.
Maybe three minutes down the road after starting and I am able to start adjusting the heat around.
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Old 11-04-2017, 07:43 PM   #48
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When the temperature is in the minus column as in below zero, you would understand.
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Old 11-04-2017, 08:37 PM   #49
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Even in those temps my HHR is blowing "warm" by time I get to the end of my driveway... Admittedly I have quite a long driveway, but they do warm up fast, considering.
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