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I don't think it should matter as long as you start coasting several km/h faster than your "start" point for all the tests. Forces (and accelerations) do not have a "lingering" sort of quality. So when you end up at your test start speed (B), the car is experiencing various "negative" forces that are dependent on current speed that should be the same for the car driving that speed at another time, regardless of if it was going slower than B a second ago, at B a second ago, or faster than B a second ago. Since you're in neutral at this point, the "positive" force is zero for all the trials as well. So it should be the same.
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