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I did read through this entire thread at one point, but have since forgotten. Did you do any pre-modification coast down tests with the spreadsheet to validate its accuracy? I'm not trying to question your results, but rather the accuracy of the spreadsheet's calculation. This is just one thing that I plan to do before I start doing any aero mods on my own vehicles. This would ensure that even if the spreadsheet is wrong I would have a baseline to work from and can more accurately evaluate the test data.
BTW, I too was under the impression that the Insight's cd was .26? I've never read differently anywhere else.
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