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I went from 17 to 18 stock to 18 to 19 ish with a superchips. managed to get 22 one time from my efi live tune. now milage is in the tank with the current tune i'm working on... but its more for 1/4 mile runs so who cares about milage there lol
i'll see what I can come up with. better get a tranny though. I have a few that will turn the guts to mush