It depends where you take the measurements, if you are using time taken to cover the distance then maybe, but I think the way Julian recommended to do it was to keep your foot in the same place on the throttle and wait for the speed to settle to a stable value and then take the measurements using an accurate speedometer/GPS/Mobile phone app.
If you are using the time taken to cover a distance, you need to be at the top speed before you get to the tree so get your foot on the throttle well before you start the measurements. Hope that helps
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