I am sure that the writing is on the wall regarding introduction of diesel engines across North America. Europe is over 50% diesel in passenger vehicles now. Most of the other continents run strong fleets of diesel vehicles. We're staring to see positive signs that other manufacturers will bring their diesels over once they can meet the emissions criteria.
I believe CATCRACKER is right: Oil companies drive the prices to max their profit. I'm sure the oil barons are helping to support strict gov't emissions standards. They are also artificially inflating diesel costs. Why? Because they win on both accounts:
A. the technology to meet standards for clean burning diesel emissions is still developing, requiring an increase in displacement to meet power requirements (with a corresponding increase in fuel consumption - e. g. 6. 7L); and
B. By driving up the prices, they maximize their profit on fuel sales, while concurrently discouraging people from driving or buying diesel engined vehicles.
Ultimately, the consumer will decide. If we're smart enough, one day we'll all be driving diesels or hybrids of some sort, with the gasoline crowd shrinking to the minority. In the meantime, I'm going to increase my shares in OPEC, Shell, EXXON and whomever else is taking me for a ride. At least I'll feel like I'm getting in on the game.