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Attached air flow is exactly what one needs to remove.
One can't argue with results, unless they want to replicate the tests.
Using clay is an excellent method because it can be removed. And let us not forget the extra weight the clay added.
The proof is in the pudding. No theoritical laws mean anything if the process works anyway. Observation is the only true sientific method.
By the way, this is not about windows. They cannot be helped and that is why they are removed in fast cars.
MetroMPG has interesting points, but the test should be done with fuel injection and a air-flow sensor to meet the exactness we need to see.
One can also do the test both ways, different times of day, etc.. But I am not convinced that such a large difference is needing any more detailed tweaks. It pretty much stands alone.
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