I own one, I have been in 3, I have driven 3. I have hammered down all they got and best I have seen in mine is 66.8. Best Ive ran in buddies 67.8. I keep reading and hearing how eveyone is running 70-72mph, but I have yet to attain it, I have yet to even see it actually posted. (VIDEO GPS). Someone please put up a video or put this myth to rest lol. Oh and I love my new Z19 and I'm very pleased with 66-67 FYI. I just want to see what everyone keeps saying.