Quote:
Originally Posted by paterick4o8
I use 91 occasionally I guess just to help clean the engine. Probably doesn't do anything but eh, it's Costco 91 so it's about the same price between 87 & 89 at regular stations
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If the engine is tuned to run on regular you won't benefit from using premium. In a nutsell the higher the octane the slower it ignites so when your piston moves up to Top Dead Center (TDC) for combustion, using premium fuel may reduce power and fuel economy- unless you advance timing and/or increase compression via taller pistons.