The 7.25 is the number of car lengths past .9 of a mile. It is aprox done by eye, but I used the same start point so can judge the difference in the ends.
Yes I did leave the car on and used the same cruse setting for each run. I hit resume before my start spot and gave it time to steady out, then put the clutch in at the end.
I think that today it is a lot calmer out, I might do some more runs. this time I will do it on a flatter road. I think I also will only do 1 mile each way to save time.
other hints?
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