Hey all, dumb question.. does anybody know how much power a 400R looses when run on non ethanol rec 90 fuel? Looking for a real answer. I know they run fine on it, but is there any data on this?

Thanks,
Tom

I don't think they lose any power, as my 400Rs ran great on our **** California 91 octane fuel. They ran fine when stock and after I had the tunes in the ECUs. Our fuel out here has ethanol in it also, which would make me guess it is no better (or even not as good) as your non-ethanol, Rec 90.