So, how efficient are the new diesels? UK powertrains now in database.

Thanks to tax incentives, diesels now account for a large percentage of car sales in many European countries. These engines tend to be more powerful, smoother, and quieter than the diesels of even five years ago. The most extreme example: the 5.9-liter V12 monster Audi offers in the Q7. It produces 500 horsepower at only 3,750 rpm, and 737 pounds-feet… More →