I've been running 6 to almost 7, depending on use. I'll run 7 at the track, 6.5 autocrossing, and 6 in the winter. I've never noticed any difference in anything.


-Philip Maynard '95 Contour [71 STS | Track Whore] '97 Miata [71 ES | Boulevard Pimp] 2006 autocross results