I would still tune for 93 octane, Flex and E85R, so that you will be able to see the most bang for your buck and have the availability to run E85 whenever you run across it. Say for example, if you go to race the car, you can put it on E85. If you can’t find it at a local gas station, it can be ordered in 5 gallon pails just for those special occasions. Lastly, it burns cleaner than 93 pump gas. Another thing you can do is add a CAI kit for a little extra bump.
Gotcha. I run gas station E85 almost all of the time, except when I use nitrous, I run this. It may be worth strongly considering, just to get tuned for Flex an E85R. After that, you can switch back to the 93 tune until you either find a station with it or buy more by the pail when you want to run the car all out. Look at this video below to show you the difference in the burn between gasoline and E85. If nothing else, periodically running it would help clean carbon deposits from your engine.
