'Clean' diesel fuel in works for 2006

This new mandate for lower sulfur will allow the development of diesel engines that get eeven better miles per gallon than they do now. It will also be very good for biodiesel demand.
'Clean' diesel fuel in works for 2006:
by Bob Golfen -- The Arizona Republic -- Aug. 13, 2005

Clean diesel fuel may sound like an oxymoron, but a fundamental change starting next year will help clear the air and possibly bring diesel engines into the mainstream.

Under a federal mandate, oil producers must reduce the amount of sulfur in diesel fuel by September 2006, bringing it down from an average of 500 parts per million to a nearly non-existent 15 parts per million.

The changeover to ultralow-sulfur diesel fuel will allow the nation's fleet of trucks and buses to run cleaner, emitting less nitrous oxides and fewer particulates.

It's also expected to spawn a new generation of clean-diesel cars and trucks that still get 25 to 30 percent better mileage than comparable gasoline-powered vehicles.