I have always used premium in my Cobra since the day I bought it new in 1996. I've had a mechanic tell me I should be using non-ethanol. The local Murphy's (Wal-Mart) has Ethanol Free Premium. It's not marked with what the octane is. It is 40 cents a gallon more. Just trying to figure out if this mechanic is right, or if I should keep on doing what I'm doing? Thanks in advance for any advice.