years ago. A couple of things I remember: 1) the system wasn't ready when the testing started so all cars passed with random passing numbers, 2) 3/4 the way through the study I discovered that a software bug (not mine) was setting the simulated vehicle weight of all vehicles (on the electric dynamometer) to 3000lbs. So that is why we can't get the Geo Metro up to 50 mph ! 3) Toward the end of the study every other vehicle scheduled for test was an RV/Camper. This test was to determine the relative accuracy of low/med/high priced emission testing systems.