Thumper, I appreciate your comments, but here is where I am still at a loss. The runs that I made in November was at 71 degrees.... So, 10 degrees cooler. This was prior to my Dyno tune and DRs. I really do not think that 10 degrees, with 600' lower DA would completely negate the benefits of the Tune and DRs. Or, am I totally off base here. Thanks