[M_a_t_t]

I wouldn't bother making the final decision based on those 2 facts. I want to know reliability of the drivetrain, etc. I'd consider the cd and weight to be byproducts of the vehicle. No reason to try to save gas if you're buying a different car early because of the drivetrain.

That being said, if they truly are the same but with those being the only 2 differences I'd probably go with the heavier, but aero one. Utility reasons mostly. Good technique can trump specs. Looks at funkhoss's caprice.