Interesting. I got about 18 mpg city and 28 mpg highway with my car on gasoline. That was with a stalled automatic too.
I see around 13 city and 20 highway with it on E85 now. Similar power output. I do have 3.07 gears and a lockup converter though.
cruising on fwy in the supra i think its close to 13-15 mpg last i checked and i babied the gas. the AFR's were 15:1 during cruising so its not like its dumping a ton of fuel. that was a 200 mile trip to/from and i babied the gas because there was no E85 in the area.
Its likley my driving style, im not very kind to the gas pedal. Even when I had stock hondas, i'd drive the car and log the MPG and my gf would take the car and i'd log her MPG. Needless to say no matter what I'd lose even though i drove like a grandpa.