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I agree and that could explain the differences especially in cars with diffusers/tunnels. Although I don't think the GTR gains a lot of downforce from the underbody so i'm not sure about the gains from a rolling road/reality. This also dosn't explain the frontal area or possibly the cd discrepancy for the GTR. Windshear is just under a mile away from work and A2 is less than 5 from where I live, pretty cool stuff.