I always run 92 octane, Chevron, Texaco or Shell. Ran some BP gas in it one time and patoooey it ran like crap... was at a Chevron that only had 87 octane and it ran ok! weird.... BTW: Gas up here is 3.67 a gallon... With only 8.6 to one compression, the 650L should run just fine on 87 octane. $3.67, wow. I don't feel quite so bad. I thought that SoCal was the home of the highest gas prices, but I only paid $3.59 yesterday.