[MetroMPG]

Wyatt - please explain in greater detail. How does what you said affect whether the car decelerates at a different rate between speeds B & C depending on at what speed, A, the coasting begins.

Also, the instructables page says nothing about the relationship of the top/initial speed where coasting starts to the speed where data collection starts. It simply says start "above" the speed where you wish to start recording data.