Quote:
Originally Posted by freebeard
25-0 would take maybe half the total time required. A constant uphill incline might speed things up.
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I suspect you'd have to be extremely diligent to discern small aero changes with a 25mph coast down test since rolling resistance would be the primary force working against you at those speeds.
Your end on an uphill idea is a good one if you wanted to do quick & dirty A B A testing. Using flat ground (and averaging runs in both directions) would be better if you wanted to take your speed vs time/distance data and try to calculate your car's coefficient of rolling resistance & CdA in a spreadsheet.