I've always been curious about the emission differences between CNG and gasoline. This year I had to get my bi-fuel 2000 Ford Contour smogged, so I thought I would find out.
When I first bought the car in 2005, I had it smogged on CNG. The guys working at the smog station had never smogged a CNG vehicle before and were actually fighting over who would get to smog my car.
This year, I smogged the car on gasoline. Same vehicle, same test, different fuels. There is a four year difference between the tests, but I'm too cheap to pay for two smog tests, so these numbers will have to do.
vBulletin doesn't have very good table capabilities, so I've scanned the smog reports and attached them to this post as jpg files.
CNG is clearly cleaner on CO2 and hydrocarbon emissions and NO emissions are virtually non-existent, the CO results favored gasoline.
When I first bought the car in 2005, I had it smogged on CNG. The guys working at the smog station had never smogged a CNG vehicle before and were actually fighting over who would get to smog my car.
This year, I smogged the car on gasoline. Same vehicle, same test, different fuels. There is a four year difference between the tests, but I'm too cheap to pay for two smog tests, so these numbers will have to do.
vBulletin doesn't have very good table capabilities, so I've scanned the smog reports and attached them to this post as jpg files.
CNG is clearly cleaner on CO2 and hydrocarbon emissions and NO emissions are virtually non-existent, the CO results favored gasoline.
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