i just put some 93 octane gas in my gt.about a quarter of a tank. when it goes empty im gonna fill up with 93 and change over from an 87 octane tune to the 93 octane tune. my question is, will i have to reset my tune for my 3.73 gears and non-stock tires to correct my speedo? or will that info go in with the 93 octane tune? thanks.