None that we noticed, either on the race track or the street. We were required to buy our gas from the pump at the Nashville Fairgrounds track, which was actually 106 Octane and was really too slow-burning to run right in the 9:1 compression engines we were required to run. I found during dyno tests that using street-grade premium gas made the engines run better, particularly with a little Diesel mixed in. The gas was dyed blue so the tech inspectors could take a sample and see if we were running the track gas. Sneaky Pete time- - - -mixing a little machinists' DYKEM blue layout dye with the gas made it look just right! The track gasoline cost about $6.00 a gallon, back in the late 1990's!
Jerry
