No matter how you burn CNG VS Diesel Cng will burn cleaner. It is easy to make your diesel truck to smoke try to smoke CNG..... EPA is just a good example of bureaucratic machine...
When it comes to adding CNG to a Diesel vehicle you are not converting it to run on CNG you are replacing expensive smoking stinky Diesel with cheap clean CNG.... 50/50 mix means you use 50% diesel 50% cng.
I converted my Astrovan to propane and drove it over 100k. My oil was always clean even after 10k. Last accident sent to dump unfortunately...
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