Measure the drag coefficient of your car

[NeilBlanchard]

I'm surprised I didn't mention in my post (#26) above is that I video recorded each coast with the camera focused on the ScanGuage II, with the speed set to KPH. This makes the time *much* easier as you just stop the video at the moment you hit 70kph and note the time, and then let it play for 10s and then note the speed, and then play another 10s, etc.

You can do this far more accurately than doing manual data recording while driving, and it only takes one person rather than two.