Gains from E85 (ethanol) on an N/A bolt on 370Z

VitViper

A tune. Injectors if you want more breathing room.

Dash. Which has always been accurate on other vehicles I've converted (such as the new Coyote -- got 13-15mpg on E85, verified manually). I'll verify the reading next fill up, which will be a "combined" mpg (as I do a lot of city type driving as well).

My point was in boost it does consume a ton more fuel than pump. I don't know about you, but even small amounts of throttle input to do light acceleration would put my turbo cars into at least some level of boost, and as such into richer AFR targets than stoic at cruising.

I can give you much crazier examples -- I have a guy with a high c/r N/A 2.5L motor build in a Honda that gets crappy gas mileage on pump, but on E85 he does 40-50mpg -- the car will go from Ventura to Sacramento (California) on 2/3 - 3/4 tank of gas (it's a Civic, so roughly 9-10 gallons).

My turbo S2000 gets 19-21mpg on the freeway on E85 with a built motor. Factory they're rated 22mpg.

These are definitely the exception and not the rule... as usually I do see a 20-30% hit to economy on E85, but I can't say it's "always" after doing it long enough on a bunch of different platforms.