Quote:
Originally Posted by jeff88
Just wondering what would be the best ratio would be. Diesel has a high energy content but is very dirty. Gas/petrol is lower energy content, but cleaner. Is there any other fuel that would have a better ratio (maybe alcohol, natural gas, propane, bio-fuel, etc.)? I know bio-fuel is essentially zero carbon footprint, but leaving out the whole growing it first takes out CO2 thing...
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ANY of the common fuels available can be burned cleanly enough to meet Tier II - bin 5 levels. Are you speaking of measured cleanliness at the tailpipe? Or are you referring to "well to wheels" cleanliness?
If you are referring to the CO2 output per mile, it is hard to beat a diesel, all things being equal, for grams of CO2 per mile. If your bio - diesel is sourced from a low fossil fuel expended source, even better.
Waste vegetable oil in an older diesel application is about as low as you can go with this line of thinking of reducing CO2 emissions per mile.