[axel_2078]

There's a big misconception that higher octane fuels equals higher performance. That's not how it works. There are higher octane levels for engines that have higher compressions. It's not "good, better, best." It depends on what your engine is rated for and what the manufacturer recommends for it. And for that matter, the quality varies among octanes as well. Joe Bob's 91 octane may be dirtier and contain more contaminants than BP's 87 octane. This Citgo's 89 octane may be dirtier than a competitor's 89 octane. If you're using an octane that's rated higher than the compression needs of your engine, you really are throwing your money away. Numerous studies have been done on this, but I'm too lazy to search for them. I'm surprised no one's brought this up already.