I can only think of two places in my surrounding area that sell 91 octane gas. I run 93 all the time, but I remember reading that you should run what the manual says.
I'd imagine it's not a big deal, but would 91 run more efficiently? Could I do something to utilize the better gas, like raising compression. Maybe I could get a valve adjustment, and while I'm at it grab a thinner head gasket?
Or should I just shut up?
