I still think the biggest issue is the diesel emissions stuff. Euro emissions is getting tougher and the US emissions are getting tougher. The Euro IV and V emission requirements almost eliminates the diesels overseas, but you know they will find a way to make those diesels meet the requirements. Overseas, about half or more of cars sold are diesels. Here in the US it is about 1%. I don't think us Americans are in the economical frame of mind, so small diesels aren't going to be a big seller - at least in the minds of the Big 3 corporate folks. They would rather sell the big profit vehicles, rather than a low profit ranger anything. So the Big 3 aren't into helping us, but helping themselves. But isn't that the name of the game - big $$$ and making the stockholders happy? (How happy are they now?)
The big problem with the Big 3 that I see, is that they don't have the products to keep them afloat. Once the big profit items stop selling, they are forced with losses, plant shutdowns and layoffs. If they had a varied engine product line (for example), they could ramp up that production and at least minimize those losses. Having a CRD (common rail diesel) that could fit and be an option for many of the vehicle line, they could keep selling those vehicles. They could have a standard issue V6 diesel, for example, for anything from the ranger, F150, SportTrac, and other vehicles. That diesel could then be tuned for the vehicle it is in for reliablility of each drivetrain and components.
I think right now they are just waiting it out. I think they hope we all start buying 400hp vehicles again once the gas prices drop a few more cents. After all, a vehicle isn't about transportation, it's about flaunting status and impressing the neighbors, right?
So in conclusion: They can build a 4 door diesel Ranger if they wanted to. It's there and they are doing it. Just not here in the US. Somebody did a Six Sigma project and figured that there wasn't enough profit in building them for the American market, I suppose. So we are stuck wishing in one hand... I am staying with my paid for '96 F250 Powerstroke that gets 18 mpg, and my paid for '99 Chevy Metro (50+ mpg). Got cash in hand ready to spend and nothing on the market that interests me. I'd really like to buy a Ranger, but economically (and doing the math), my fuel economy will remain the same, my insurance would go up, and I'd have a vehicle payment to boot. It's funny how a 4.0L Ranger gets the same fuel economy as an F250 7.3L diesel!
I'm done now.