The 2009 Audi Q7 TDI is being billed as “the world’s cleanest diesel SUV,” with 50-state emissions compliance and 17 city/25 highway fuel economy. It’s not cheap to buy race-proven diesel technology in an SUV, though: the Q7 TDI starts at $50,900. This doesn’t include the $825 destination charge, but it also doesn’t factor in the $1,150 Alternative Motor Vehicle Credit from the IRS.
In addition to getting 600 miles per tank, the diesel engine delivers significantly more torque, which is useful for those who actually utilize their sports utility vehicles, say, when climbing a steep hill. The Q7 also produces 25% less carbon dioxide than gasoline engines and emits 90% fewer nitrogen oxides than the stinky, old diesels of yore, according to Audi.