[aldersonjames20]

Based on this thread, I went and filled up my SPF with 100 race fuel the other day... cost me 60 bones for 12 gallons. I noticed very little if any difference in the way it drove, ran, and sounded compared to the 93 I normally put in it. Now I realize that if I was going to be road racing and sitting at 5-6K rpm for extended periods its better for the engine, and i can't really see if its healthier for the engine without comparing plugs after a drive with each, but I just am not prepared to spend the money for anything over the cost of 93 for normal driving. Hope I am not doing harm, but it sounds like its fine based on my engine setup and drivability.

James