[lets_go_bills]

There is no difference. To some it's important but any "difference" they claim to "feel" may be all in thier head. If GM designed the car to run "better" on a higher octane rating, they would recommend the car run on it. The manual says 87 octane is fine to use. Use that.

Octane levels have nothing to do with fuel quality. Always buy your fuel from a reputable company.

Want the added detergents and additives? You don't need higher octane, buy STP fuel cleaners/additives/boosters. They make great products and you only have to use it twice a year ($5/bottle). It'll reduce any knocks, improve fuel economy and restore power/acceleration.

Just my opinion, but anyone who uses anything above 87 in their V6 is being silly and wasting their money.