G-Techs always give a much higher MPH because they give your actual MPH in the 1/4 mile, at the track the MPH is estimated and not actual, my car runs about 112 or so with a g-tech and 106-107 at the track.
------------------
98'Trans Am LS1 A4 273 gears. Whisper lid,Whisper MAF ends,K&N,Flowmaster,Best ET on street tires 13.17 @ 106.49mph
NEW MODS:3" Flowtech cutout,Magnecor wires,NGK TR55's,180 thermostat.