Jeff,
The first MPH timer is 66' before the finish line, and the second is 66' after the line. (132' total, 1/10th of the 1320 quarter). The average MPH over that distance "hypothetically" occurs at the halfway point, or the finish line. Of course, depending on where the car is in it's rpm/horsepower band, the actual MPH at the finish line might be quite different than what the time slip says. After all, the car is accelerating.
Which, by the way, brings up a certain way to have a lower MPH on a quicker ET run. Just let off the gas as soon as you cross the finish line, a little before the final MPH light.
Verne
