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 of torque at just 1,750 rpm. The next rung down, Audi, BMW, and Mercedes all offer V8 diesels, but these also sell in low volumes.

The meat of the diesel market begins with small fours and tops out with sixes around 3.0 liters. We’re now getting some of the latter in the U.S. Only VW currently offers a four-cylinder diesel in the States.

Even with gas engines, far more choices are offered to buyers in the UK. The 3-Series line across the pond starts a pair of 141-horsepower 2.0-liter fours, one gas, the other diesel.

While most of TrueDelta’s members are in the US and Canada, some are in the UK and elsewhere. In response to requests, we’ve now added UK powertrains for recent model years of most Audis, BMWs, Mercedes, Saabs, and Volvos. Also select Jaguars and VWs.

Have a powertrain that’s still not in there? Let us know, and we’ll do what we can to add it.

So hopefully we’ll start seeing some Gas Mileage Survey responses for these engines, and get a clearer idea of what we’ve been missing out on.