Bob,
Nice thing about diesels is that they only add the fuel you ask for. Lighten up the right foot, slow down and you can get more economy. Of course there are issues...
The emissions deal is a real econ killer. They should be able to up the milage, but that would heat up the mixture - must use EGR to cool it off. That gets particles produced - must use a regenerative filter. Filter gets clogged, they must DUMP fuel to heat the filter up to burn off the particles. Sulfer is bad, must drop the 500 ppm to 10 ppm S. That raises the cost of the fuel, decreases the energy content, decreases the economy, decreases lubricity and decreases fuel system reliability. (thanks EPA!)
Sigh. Oh well, I can still get 21 on the highway. But I used to be able to get 23.5 with the old fuel.
Nice thing about diesels is that they only add the fuel you ask for. Lighten up the right foot, slow down and you can get more economy. Of course there are issues...
The emissions deal is a real econ killer. They should be able to up the milage, but that would heat up the mixture - must use EGR to cool it off. That gets particles produced - must use a regenerative filter. Filter gets clogged, they must DUMP fuel to heat the filter up to burn off the particles. Sulfer is bad, must drop the 500 ppm to 10 ppm S. That raises the cost of the fuel, decreases the energy content, decreases the economy, decreases lubricity and decreases fuel system reliability. (thanks EPA!)
Sigh. Oh well, I can still get 21 on the highway. But I used to be able to get 23.5 with the old fuel.