[Adger Smith]

I think there is a site that has the CD for each body style.
If you can find it you can see the aero difference in Camaro and Chevy11.
I think it was SSDIV6 (Joe) that sent it to me, but several computer upgrades has lost it. If I remember it was a pretty interesting study..Some cars I thought were bad Aero were really pretty good & the opposite, too..

OH! one other thought...when picking a class
With most of the 6 or 7 cars running the same engine combination going .7 or better and there might be a AHFS adjustment or two along the way.