Well, I go to the track frequently, run, and then usually watch for an hour or two. The fastest Mach 1 I've ever seen at Trails went 13.8x. So a 7 tenth increase in 100% street trim with dealership tires over the fastest Mach 1 I've seen at the track since they came out (and that includes modified ones) is a relatively large increase and not something I'm just going to instantaneously believe without asking about.