One thing I noted though. In every single case where the frontal area was stated, the 0.81 correction factor on h * w you used gived an overly optimistic figure.
I recall reading a post by phil, must have been of of his aero seminars I'll have to search a bit, where he said to use 0.87 or 0.85, can't remember exactly.
Edit: it was
Quote:
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Frontal area can be approximated by multiplying your vehicles width times its height,times 0.84.p
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from
Aerodynamics Seminar # 6 - by Phil Knox