Clevelandhhrss

I'm in pursuit of absurd mileage. I'll be tracking every trip I make on this 16.2 galllon tank of 87 octane in my 08'ss. I'll just update this specific post as i count down to empty. I will give a estimate temperature, wind if any, terrain descript....assume no A/c unless noted, front windows cracked, sunroof on vent NO CRUIES CONTROL EVER, I'll note how many times I turn off my engine other than first start and last stop, passengers....traffic etc. 36psi tires after parked in 80 sun degress all day. The avg mpg/avg mpg is the actual overal mpg shown on the dic, and the second is the "calculated by hand-split mpg". Any suggestions or comment would be appreciated..negative or positive. Not much else to say..so here goes.

Clevelandhhrss

Okay I think I have the format figured out.....
Day one...

TotalMiles. TripMile. AVGMPH. TripMPH…. AVGMPG. TripMPG… FuelRange…. Projectedrange. %highway.. epa projected mlge.. Hypermile improvement over epa..
12.4 ____ 12.4 ____ 43.0 ____ 43.0 ____ 39.2 ____ 39.2 ____ 465.0 ____ 635.0 ____ 75.8% _______ 27.1 _________ 44.8%
24.6 ____ 12.2 ____ 38.0 ____ 34.0 ____ 37.4 ____ 35.7 ____ 480.0 ____ 605.9 ____ 63.9% _______ 26.1 _________ 36.8%
27.4 ____ 2.8 _____ 33.0 ____ 15.3 ____ 35.4 ____ 24.1 ____ 472.0 ____ 573.5 ____ 0.0% _______ 21.0 _________ 14.7%
39.6 ____ 12.2 ____ 34.0 ____ 36.5 ____ 35.7 ____ 36.4 ____ 486.0 ____ 578.3 ____ 63.9% _______ 26.1 _________ 39.4%

Not sure if it is clear or not, but this is four seperate drives during the same day. I only turned of my ignition during trip 2 and trip 4 once (memorized lights sequence) and im doing 30-45 in the city and 55-65 on the highway. Trip 3 was me house shopping, horrible mileage there! Also there was a decent wind against me on trip 4. I either need to slow to 55 or accept a loss of i think 2-3mpg. I went 60..lol

Lone Ranger

Only an engineer would take MPG this into the details. I mean that in a good way, though. I wish I had the patience to do the same. I do think it good that you're using 87 octane for the testing, as that has been a question in my mind about the SS: how does it perform both in MPG and drivability on regular unleaded.

Clevelandhhrss

i due suffer from a little madness from time to time. Check out what time I placed that first post. I get up everyweekday at 5am (12:30 am friday night since my last update changed the time)

I figure I would help put some things to rest. An promote effcient driving with whatever vehicle you already own and without slap this on your car gimmicks. As i get a basline, i would be willing to slap on some cheap gimmicks, and put them to the test.

That bsr tune has my name on it. i should save enough in gas to buy it in a year or so...lol



I just re-read my last sentance. In no way do i mean that the bsr/hahn tune is a gimmick. Just relativly cheap and significant power, no BS, and no mileage penalty...possibly better with 91....... who dosen't want more of that!

a76marine

Cleveland... what techniques do you use to improve MPG? You're obviously not doing any joyriding or quick starts.

Clevelandhhrss

No, ....no quick starts, no speeding, no "fun". I am just experimenting with the limits of my driving savvy and the fuel economy (FE) potential from this 2 liter.

Basically I drive 5 below the posted limit.

No cruise control EVER

Use Pulse and Glide (P&G) when advantageous...well actually Pulse and Neutral-glide.

Turn off my car at stoplights if I can predict a long wait. Or at any 6-way stop/ 4-way with dual turning lanes.

Glide whenever possible, any hill, or elevation that wont cause more then a 5mph drop.

Start-up with just the engine, I can make it to the highway from my apartment without ever touching the gas pedal ...approx 1 mile.

Memorize frequent routes, for elevation, stops, lights, turns, traffic patterns etc.

Never idle

Never ever ever draft.

The best feedback i get is simutaneously using the "vacuum gauge" and the inst-mpg. I keep the VG at -10 or under whenever possible, and the inst-mpg as high as possible while keeping the speed up..


The most difficult thing is adjusting to the combination of elevation change, 55-65, and the VG at -10. When all these meet, I get about 40mpg. It is the transition between flat sections that takes some concentration.

I would like to say that I do not sacrifice my safety for this pursuit. If traffic is going 70 in a 60 I do 62ish, if they are doing 65 I am doing 57ish, if i lived in a state that would let folks drive 75 on cruise without the fear of driving by THE MAN, I would do 67. I like to keep an 8ish mph below the natural flow. I can go slower if there are 4 or more lanes. But when there are three and dense traffic ....or simply 1 or two lanes, i don't make the entire world wait for me. Usually i can avoid this as my daily routes do not put me in this situation, or I can choose a different route.

I love great handling cars, and like a little power like the next guy. But that is for the next tank!

I can talk for days if you want more specific answers about technique.

Clevelandhhrss

Day number two!

TotalMiles. TripMile. AVGMPH. TripMPH…. AVGMPG. TripMPG… FuelRange…. Projectedrange. %highway.. epa projected mlge.. Hypermile improvement over epa..
39.8 ____ 0.2 _____ 33.0 ____ 4.8 _____ 35.6 ____ 22.9 ____ 483.0 ____ 576.7 ____ 0.0% ________ 21.0 _________ 9.0% street to garage
68.2 ____ 28.4 ____ 37.0 ____ 44.6 ____ 35.9 ____ 36.3 ____ 513.0 ____ 581.6 ____ 78.9% _______ 27.3 _________ 33.0% to friends
95.6 ____ 27.4 ____ 37.0 ____ 37.0 ____ 36.3 ____ 37.3 ____ 485.0 ____ 588.1 ____ 74.5% _______ 27.0 _________ 38.5% from friends detour construction

I was driving and talking with my best friend most of the way, I was kinda distracted from hardcore hypermiling. But a much more enjoyable drive...lol. I dropped from 36.5mpg overall to 36.3 in the 1.7 miles from the highway to my apartment due to an accident in the busiest place in ohio on saturday night. I turned my car off for a while but i had to weave through drunken traffic, a few cruisers and some 300C's with 24inch rims...lol
My parking garage is 3 stories below ground, so getting in and out drops a bomb on FE. Oh well, the price i pay for security and convience. driving out is much worse because after a cold start up, using the gas to pull away, instead of just the idle will yield about 2mpg for the .3 miles. So in other words I got about 37-38 on my way TO my friends house not counting getting out of the garage...amazing what little things do to FE.

Lone Ranger

When you can't stand going easy on it any longer and have a few horsepower moments with it, I'm interested in how it performs under bosot on the 87 octane fuel.

Clevelandhhrss

I prefer 94 octane actually, I don't hypermile for the $$ savings, just to push a limit..... just because it's there. I don't have a monitor, dashdaq (man does that think look sweet), dashhawk, scangauge.... etc to monitor timing, a/f ratio, fuel/air demand vs delivered.... So i would not be able to give any scientific data on performance. I drove to Niagara falls, and all over PA on a tank. That was the trip where I check out the top speed of this little motor. I was also carrying a full load: 3 passengers and luggage, so at 750 pounds of passengers and luggage, my 4100 pound hhr reached 130+ just fine. As for droppin the hammer after toll-stops, it felt sluggish, but that was due to the weight and maybe 90+temps. I have a feeling that at 15psi or less of boost, 87 is just fine. Now at 21-23 and 6000+rpm if i was tuned, 94 all the way.

02z28

out of curiousity, why no cruise? cruise will do nothing but help your mileage