I'm not trying to say you should get a hybrid. They just happen to be some of the most aerodynamic production cars to compare to. The Camero isn't bad aerodynamically, but it certainly isn't the best around.
Here is our vehicle cd/cda list. cda is the number you want to look at and the lower the better.
Vehicle Coefficient of Drag List - EcoModder
Also, the Honda Insight can be driven with the pack disabled, you just loose the nice hybrid functions that make the car easier and nicer to drive. Insight owners can jump in with more info than I can provide though.
