[aerohead]

I found my installment on wheels/tires.Looks like you could expect perhaps a 1.5 % mpg improvement on the HWY tops.In a broader picture however,for anyone considering aft-body streamlining,the discs will help create a quality airflow ahead of mods,without which,the mods will not function.If you have no plans for rear extensions,then aspirated wheelcovers are fine.If you're going for a boat tail,you'll probably want to consider full discs,as well as full skirts.Go easy on your brakes!