Re: No Easy Answers
> Careful there. Diesels are known to generate a lot more soot
> and other types of pollution that are now under much
> stricter controls in some states.
Europe has solved the diesel emissions problem with particulate trap filters. However, this technology requires low-sulfur diesel fuel, which is not yet widely available in North America. New low-sulfur standards for U.S. diesel fuel are supposed to be implemented next year, after which point our diesel fuel will be pure enough for these new emissions control devices to work properly. (Low-sulfur diesel fuel will also help to clean up the emissions of all existing diesel-powered vehicles, although not as greatly.)
> You may not be able to get
> that old diesel through your state inspection anymore.
A vehicle can only be tested and judged according to the emissions standards in place when it was built. It has to be done that way, otherwise all gas-powered vehicles built prior to 1996 would have to be taken off the road and junked because they don't meet the current 1996+ "OBD II" emissions standards.
Furthermore, in many states there basically is no emissions testing for diesel cars and light-duty diesel trucks. Here in NJ none of my diesel cars have ever been subjected to emissions testing. NJ only requires emissions testing for heavy-duty diesel trucks, to help get the horrendously smoky ones repaired or off the road entirely. Only a small minority of passenger cars are diesel-powered, thus strict emissions testing for them is not seen as a priority compared to emissions testing for the large majority of gasoline-powered cars.
> And,
> diesel fuel is more expensive than unleaded in a lot of
> places, which will lower your savings.
Right now in my area of NJ, diesel is selling for 25 to 40 cents per gallon less than regular-grade gasoline. Although I don't expect that kind of major difference to last, even before this week's price hikes, diesel was already selling for slightly less than regular-grade gas.
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