If I'm going on a long trip and I set the power level to 500hp I don't see any reason why I couldn't run 89 octane fuel. Compression ratio is 9.5 to 1 and from what I understand there is no boost at the 500hp level as it keeps the bypass valve in the supercharger open. Am I missing something? Please don't quote the owners manual as I'm able to read. I just can't see why I couldn't do this while cruising down the interstate and save a few bucks on fuel as the added octane is really not doing anything for me in the scenario. I wouldn't think at 9.5 to 1 I would want to use 87. Any technical thoughts?