my predator is coming next week, and I dont plan to do all the custom tuning just because I am new to tuners and dont know what I am really doing, so I only plan on doing one of the preset tunes. After searching I couldnt find the exact answer to this question. How many people have tried both tunes and noticed a true improvement of the 93 octane tune over the 91? My car will probably never see a track, so if it is .1 seconds faster in a 1/4 mile then it really isnt worth it to me to spend the extra money for higher octane gas. Any numbers?