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Diesel cars typically get about 30 percent better fuel economy than similar gasoline-powered cars. They also emit more nitrogen oxide (NOx) and particulate (soot), which has kept them from being sold in all 50 states. But a new blend of ultra-low-sulfur diesel fuel is expected to pave the way for new, cleaner-burning diesel vehicles.
The fuel will let diesels use new emissions equipment (catalytic converters and traps) that will significantly reduce NOx and soot. That equipment couldn't be used before because the high sulfur content in regular U.S. diesel fuel can clog or contaminate it.
The diesel-powered 2006 Volkswagen Toua-reg V10 TDI SUV, on sale Sept. 1, is the first vehicle to take advantage of the new fuel. VW says the Touareg will meet emission standards in all 50 states, a breakthrough. The caveat is that NOx standards in California, Maine, Massachusetts, New York, and Vermont will become stricter on Jan. 1, 2007, leaving the 2007 Touareg below the standard and unavailable there. For model year 2008, Volkswagen plans to sell a Jetta with new technology that will meet emission standards in all states.
In October, ...