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Can you find a back road near you that is flat (or close to it) for about 1 mile. Then set cruse to 55MPH (or the speed limit) go till you hit a known point (drive way, power poll.etc) does not mater what, just so it stays the same. At the mark put it into N and coast to a stop. Mark the spot with some chalk (use one color for A runs, a different one for B). when all the tests are done measure the distance from start to the first mark. then measure from there to each other mark. this will give you ABA data which is way better in terms of useful data.
What slope is your kammback?
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