With 1496mi. on 100 octane fuel and an MTH Tuner File remap, the dyno showed a +3HP and +3.6ft.-lb. torque improvement over 91 Octane (w/ Tuner File for 91). However, there was a serious dip at 5600RPM. At $6.20 a gallon, it's not quite worth it for a daily driven street car... for me anyway. Still, the ride was a bit more perky. I'll be uploading the 91 octane Tuner File before my next fuel fill up. See my gallery regarding mods.