You all don't understand engines do you! Ok lets look at a Lotus Elise, it is sub 200 HP but it requires high Octane, HIGH COMPRESSION ENGINE. Similar to the Crossfire, it is Chemistry and Vapor Pressure not performance. We have a 10:1 compression engine use lower octane and you are running a retarded timed engine, and lower HP. So here is what I have to say go ahead and run regular if you are wanting to drive a retarded timed car go for it. I don't care and many others probably don't. I would classify you as a dumb tight wad.