How much air pressure are you guys running in your QTPs? I have been running about 16.5 and they seem to 60' very consistently in the low 1.70s. However, the last time I got it off the trailer in the driveway I blipped the throttle to clean the rocks off the tires - at least that is what I told my wife when she saw the black marks. Looking at the contact patch on the cement, it looked a little darker on the edges which I've read means not enough air. Remember also, I weight 4050 race ready. BTW, I run 27" x 11.5" tires on a 10" rim. Thanks.