Higher Octane will not improve your MPG all by itself. However, E85 is not the same as using lower octane because it
does get less MPG and HP.
I have used E85 a couple times, you get less mileage and less power, and you pay less. But it works out about the
same as far as costs go. Spend less but more often.
I think E85 is a waste of resources. No corn is going to waste so we can't say it only uses excess corn etc.
I believe we do need to experiment with it and other possibilities. Maybe one day they will find a way to make fuel cost
less and get better MPG. That will be the day after pigs make regular flights from Toledo to Cincinnati unless the Fed
finds a way to replace lost tax revenues and oil companies don't loose thier axx.
Can we use hydrogen?
I use 87 most of the time. Once in a while I use higher octane.