Quote:
Originally Posted by jimepting
BTW, have you driven an Insight?
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He has one.... but no garage entry for it which would put his contributions in context (hint, hint!).
Quote:
Originally Posted by RobertSmalls
If all you have is a long, steady grade, you might be able to tease a CdA number out of it,
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If you simply want to know if a particular aero mod is better, worse or indifferent from baseline, I wouldn't worry about the math or finding the "perfect" road. Simply repeat the coastdown over the same stretch (absent other traffic, in consistent weather conditions, with a fully warmed up drivetrain) and note the delta in times. The higher the initial speed and the longer your coast, the better.
It's tasty knowing the actual MPG impact, but "powered" testing is more difficult.