My wife's 1992 Saturn SL1 was recently run through the treadmill emissions test for Maryland, and they give us a printout with the results. The good new is, we passed easily. My question is: are these readings unusually/impossibly low? HC: 0.009 gpm CO: 0.219 gpm NOx: 0.021 gpm These are all at like one percent of the allowable amount. Cow orkers with similarly old cars seem to be passing the tests with 20-50% of the allowable amount, and this makes me wonder if any exhaust was even coming out of the tailpipe of our car! (Maybe a leak, or maybe they did the test wrong, or...?) The car is low mileage and has been well maintained and even a few emissions-related things changed over the years (PCV, Canister Purge Solenoid) in response to check engine codes. Tim.