RENNtech tuned my SRT 6's ECU for 93 octane, but I run Sunoco Ultra 94 in it. There has been a few gallon of 93 put in it, but that's only if 94 is not avaliable. The car only has around 3,400 miles on it, I drive my truck to work because I park in a small gravel parking lot and there's a lot of dust from people driving by on a short gravel access road . That's one reason for the low miles on the SRT 6 plus the fact if the wife and I go anywhere she hates to ride in the SRT 6, so we take my truck or her Envoy.