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Old 01-30-2012, 10:00 PM   #19 (permalink)
mechman600
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If you are pro P&Ger with EOC, shut-off at stop lights, etc., chances are good that you will be running the engine 50-60% less than "normal", depending on many factors. So if the cat isn't quite hot enough and your car is polluting twice as much ppm than normal, very rough math has your overall net pollution remaining the same with a sharp reduction in CO2. If you look at the actual readings before and after in the post #1, the overall ppms of nastiness are not even close to twice as much in the first test.

I would argue that slightly higher ppms on a smog test because of monitors not being ready is far outweighed by the 50% reduction of the "m"s (in ppms) being created.
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