I just installed
http://opengauge.googlecode.com/svn/...no/mpguino.pde and drove around the block (my neighbors must think I'm really weird because I keep doing this).
I confirm that the timer on the CPU screen does stop.
The problem I am seeing is on the "Tank" screen. The MPH drops as expected when I stop the car, but even after the backlight goes out, the tank MPH continues to decline. I probably wasn't as clear as I should have been earlier.