On full E85, probably same as stock if not a hair better, assuming highway mpg @ 80.

Thats good to know, so I shouldn't expect any loss from e50 then. Thanks for the info.

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Assuming you drive conservative and have tuned for it yeah, you shouldn't. There's a video earlier in this thread I think that shows me getting 27/28 MPG per the AP on 50/50 mix at 75 MPH with the AC on.

I live in the middle of nowhere, so i do all highway, very little if any city driving. I can do 4th gear logs less than a mile from my house so it makes the tuning process much quicker. How is your idc on e85?

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Doing what? I'm big turbo and on aux fuel.

Makes sense, I figured e85 would max idc on the k04.

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Not usually, but it will get pretty close depending on elevation and targeted AFR.

Have you run lean burn maps on mixes?

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Yes. There are guys running pump gas on 17:1 targets for cruise, but IMO efficacy falls off sharply after 16:1.

Thanks for the info, I want to give this a shot before i step up to e50.

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I generally get around 22 MPG running highway speeds (75mph). Around town, averaging about 15 mpg. This is in a Speed6 running a 50/50 mix

I get about 21 MPG on 6.5 gal E per tank here with 80% highway driving...

MPG sucks, but my Smiles Per Mile (SPM) are pretty sweet.

I'm not sure if this is the best thread to put this in but it's relevant and I don't want to bump an old mpg thread.

For all of those people concerned about lean cruise running hotter and possibly causing damage. That is a misconception and running a lean cruise will actually burn colder than running at stoich. It is possible to actually run lean enough to run into something called cold lean where the engine cannot combust the fuel properly (typically 18:1 or above) because there isn't enough fuel and the large amount of air will cool off the combustion chamber. The reason why cars run at stoich from the factory is because the catalytic converter will get ruined if the engine runs lean or rich for an extended period of time. So if you're catless there is no harm in running a lean cruise so long as you tune for it properly.

THIS IS NOT THE SAME AS RUNNING LEAN AT WOT!


http://i36.photobucket.com/albums/e8...GTvslambda.jpg

Along those same lines, I found something interesting with my highway cruising coolant temperatures. When I ran straight 93, I found that my coolant temp hovered between 180-190⁰F during normal highway speeds and an 85⁰F ambient temperature. Now, in those same conditions running 50/50 mix, I find that my vehicle reads between 165-175⁰F. I understand that alcohol fuels burn cooler, but I am not certain if my coolant temps should have dropped that much. Is that common? I just worry a tiny bit about the block being aluminum, and not having the temps be hot enough to maintain the tight tolerances.

Um...you shouldn't have a problem keeping 180-190* coolant temps. When was your thermostat last changed?

My car ran as cool as 155* cruising on the highway when it was fully open 20*F weather.

On the mileage note gen juan, freek E getting about 280-290 per 13 gallons on e33. only a 10 mile per tank diff from the 93 tune

He could go further if he wanted to, MPG wise. I was getting 28 on the highway on 50/50; grant it, aero and drafting had a bit to do with that but still.

The cooler temps are not from running alcohol. The engine temp is regulated by the thermostat so regardless of what fuel you're running it should always be at the same operating temperature.