Sonoma, I agree with you that there is demand for a lighter-duty diesel pickup. But, don't expect any diesels in 1/2-tons or compact pickups until American diesel fuel has its sulfur content reduced from 500 ppm to 15 ppm in a year or so. Right now with the higher sulfur fuel, it is cost-prohibitive to comply with US emissions regulations.
When my 2000 VW Golf TDI was totalled about three years ago, I said that my next vehicle would be both diesel and 4WD. Few vehicle options...none of them small. So now I drive a Dodge Ram with a Cummins...not because I need the 3/4-ton truck but because I wanted both a diesel and 4WD. I usually average about 21-22 mpg in summer and 19.5 in winter.
Roy, I think you are correct. Ford, Chevrolet, Toyota, Nissan, and I think, Mazda, all had diesels in their compact pickups in the early-80's. My father used to have an '84 S-10 with a 2.2 liter Isuzu diesel that would get over 30 mpg. Dog slow, however.
There have been diesel 1/2-ton pickups in the works for several years, but they got canned for one reason or another.
Ford was going to have a 4.5 V6 version of the 6.0 Navistar-built PowerStroke a few years ago and pulled the plug due to emissions-related issues. Ford and Navistar reached a settlement on the engine development costs.
Detroit Diesel showed a 4.0 V6 in a Durango at the Detroit Auto Show about 5 years ago. Didn't make it to market.
Cummins is currently working on V6 and V8 architecture for lighter-duty, automotive applications and have a prototype V8 in a Dodge 1/2-ton. There was an article on this truck in the last issue of the Turbo Diesel Register. The article makes it sound impressive. I talked to a Cummins rep earlier this week and it sounds promising that this engine will find a home in a 1/2-ton truck, but not before the cleaner diesel fuel is in use.
Jeep just released the Liberty with a 2.8, 4-cylinder diesel built by the Italian company, VM Motori. I haven't heard one run or driven one yet, but if something would happen to the Ram, I'd seriously look at the Jeep.
Its about time that Americans embrace diesels in their vehicles. Some European countries have diesel market share over 50%...in cars!
Sonoma, do you think you have touched a raw nerve of mine?
Viva La Diesel!