[Formulajones]

Originally Posted by w72

I should be able to tune for pump gas no problem. The combo I'm running has been scienced to the moon and back by people way smarter than me, and was assembled by a well-respected pro. I plan to run 93 non ethanol whenever possible. It won't need octane booster or race gas.

My question is if the good stuff is unavailable, will I be better off with 91 non-ethanol or 93 with ethanol?

My take on it is that I go for the octane rating and don't worry about the ethanol content. I've never noticed any real difference between ethanol and non ethanol gas as far as drivability. And since non ethanol fuel is about non existent where I live now, I've been using 10-15% ethanol fuel in the cars for a couple decades now with no ill affects. Now if it were higher in the 30% plus range I might be looking at other options.

If you have both easily available to you, you could switch back and forth to see for yourself.