[spinne1]

Well, it is an urban legend (I don't know if it is true or not!) to take your car on the interstate right before emissions testing and really ride it hard for about 10 miles or so (go about 80-90 mph if you can get away with it) and "blow out" the cat. I always do it because my two LeSabres are old. However, after recently rebuilding my two engines in the past year my testing has gone extremely well. After testing my wife's car with 197K (but newly rebuilt engine) the testing guys seemed surprised at how low my numbers were because of my mileage. One number was like 14 ppm with a max allowed of 220 and the other was 0. The other car had similar numbers but lower.