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63 Miles Per Gallon?
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<blockquote data-quote="soberups" data-source="post: 805788" data-attributes="member: 14668"><p>It depends upon how you measure air quality.</p><p> </p><p>A vehicle that travels 60 miles on one gallon of fuel will emit less total pollution per mile driven than a vehicle that only travels 15 miles on a gallon of fuel.</p><p> </p><p>Diesels do emit more soot and particulates than gasoline engines, but the new clean diesel technology employs catalytic converters with DPF's (diesel particulate filters) to solve this problem.</p><p> </p><p>The downside to this technology is that the DPF's will clog up, and the soot must be periodically "burned off" thru a process whereby the computer senses a clogged filter and injects raw diesel fuel into the exhaust stream in order to heat the filter up to the required temperature. This creates compatibility issues with biodiesel, which has a much higher flash point than petroleum diesel. My 2006 TDI was made in the last year before DPF's were required, so it is the last of the truly "biodiesel compatible" cars.</p><p> </p><p>My car is a net zero emitter of greenhouse gasses, however. Since biodiesel is not made from fossil fuels, the carbon I emit into the atmosphere is carbon that was taken<em> out</em> of the atmosphere by the plants (canola or rapeseed) that grew the source crop to begin with.</p></blockquote><p></p>
[QUOTE="soberups, post: 805788, member: 14668"] It depends upon how you measure air quality. A vehicle that travels 60 miles on one gallon of fuel will emit less total pollution per mile driven than a vehicle that only travels 15 miles on a gallon of fuel. Diesels do emit more soot and particulates than gasoline engines, but the new clean diesel technology employs catalytic converters with DPF's (diesel particulate filters) to solve this problem. The downside to this technology is that the DPF's will clog up, and the soot must be periodically "burned off" thru a process whereby the computer senses a clogged filter and injects raw diesel fuel into the exhaust stream in order to heat the filter up to the required temperature. This creates compatibility issues with biodiesel, which has a much higher flash point than petroleum diesel. My 2006 TDI was made in the last year before DPF's were required, so it is the last of the truly "biodiesel compatible" cars. My car is a net zero emitter of greenhouse gasses, however. Since biodiesel is not made from fossil fuels, the carbon I emit into the atmosphere is carbon that was taken[I] out[/I] of the atmosphere by the plants (canola or rapeseed) that grew the source crop to begin with. [/QUOTE]
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