I think parking the diesel is a little over reacting. I would guess most of the 300Ds in our driveways are paid for. For the price of a car payment on a car that gets 50mpg you can sure buy a lot of fuel. I for one don't like the spine jarring that the econo box cars give on our less then perfect roads.
my .02

__________________
1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes