Just read info over on DieselForum.org and it sounds like the 2500 will qualify for the credit. Didn't completly understand all the legal talk, but gross under 8,500 was one requirement for qualifying. The credit is based on mpg for 2002 vehicle and improvements from 2005 -2010 for same vehicle. I'm sure vehicle mfgs will need a team of engineers and lawyers to prove a vehicle will qualify. Can't retire for 3 more years, so a 2007 or 08 model will be fine for me.