It runs 6.7x most of the time during the summer. I switched to e85 this year right before race season. Previous best on pump gas was 6.76 1/8, 10.79 1/4.....Right off the trailer on e85 it ran a 6.67 1/8 and 10.54 1/4 this spring...since then I got this thing tuned better, so I expect it to dip into the 10.4x's this fall. :D