Originally Posted by David Burns
Originally Posted by _fastlane
I wonder what the difference would be in performance with regular octane vs premium?
Your Crossfire engine is designed for the higher octane. Using lower than 91 would have long term detrimental effects to the insides of your engine.
Yup.
There are some cars with what I think they call dynamic timing so you can use any gas while losing 10-15% HP with 87 octane, but as far as I know, the Crossfire really has to have premium.