Posted 9/19/2024 09:45 (#10896173 - in reply to #10895586) Subject: RE: GM 6.2 Premium Fuel?
NE Iowa
Pulling a trailer down the interstate I've noticed a mileage hit when running lower octane. So, it must have changed timing. But, I can't tell any difference with regular driving on 87 vs 91.
GM 6.2 Premium Fuel?
