I read this topic quite a bit here so here's PUT.com attempt to pencil whip the cost of ownership comparing some gas engine trucks to the new RAM Ecodiesel truck. Link Enjoy...
Just as I thought; you can through a blanket over all of them.
Now, PUT needs to tie a 9K load to those trucks and head out to Eisenhower for a tow off to the top of the hill. There won't be a blanket big enough for that test. :B