I think we are a long ways from having vehicles like that. I am still thinking that most Americans still are not terribly concerned with MPG and would rather just complain about fuel prices. The ones that want to be "Green" have to have a Prius or other hybrid. Diesel is not on the radar.

My mom owns a 2001 Jetta Diesel and a 2007 Prius, the Jetta goes 15 miles further for each gallon of fuel consumed her her driving.