Notice how I'm editing my post rather than making a new one. This was my intention all along. Therefore, my post count is not added to unnecessarily and I remember to revisit the thread.
E85 will get worse mileage, as last I checked, stoich was 9:1 and it has less BTUs. However, because of its higher octane (100-104) and evaporative qualities, you can run leaner with it when not under load. Also, you can get the mileage back by increasing static compression. This is something not often done in the forced induction world; instead, we go with dynamic compression by adding boost.
I also wanted to say that yes, you DO have to pay to play with Supras; hell with cars in general. However, there is no need to dump extra fuel when not boosting, and asking how to get better mileage is perfectly reasonable, assuming they know that they wont ever get more than 30 mpg or so at best in impossible situations.
IMO it is possible to get 27-30 repeatable mpg if you drive dynamically and consciously; stay out of boost, engine brake, dont give it much throttle, etc. Overinflated tires, a tune, and a tune-up are all excellent ideas as well. These together are how I get 35 mpg consistently in a Miata that is rated for no more than 30
Also, drive windows up and turn off the A/C when accelerating.
