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Originally Posted by jediknight36
SO the question is are diesels worse for the environment than gasoline? The CDI should be better, according to various articles, than petrol.
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Depends upon what your {{national government's}} interest (and interests) and politics are. The EU is fixed upon CO2 almost exclusively and tolerate a lot of whatever goes with fuel-tax subsidized diesels. NOx is much worse for the environment than CO2, but their politics, Kyoto, et al, allows them to set it aside. And remember (one might remember if the homework has been done) that the EU burns "D50" diesel (50 parts-per-million sulphur) while we (US - not sure about CAN) are now mandated "D15" ULSD. Not that the EU is now grossly spewwing sulphur compounds, but the US EPA is trying to spew less than a third as much. A couple of years back we were blowing "D200+"! Anyway....
The EPA has some pretty tough regulations on NOx and particuate emissions, and there is some merit in it. But they have a "one-size-fits-all" mentality. The bulky, complex equipment required to meet the standards for 50-state compliance are only practical for medium-size vehicles and above (including railroad locomotives), and with readily available service support required. The smart is just too small to carry the stuff and the dealer network is just way too thin to stand with the big boys (M-B E320, VW Taureg and Jetta).
People, do the homework!