The following cars represent the most technically advanced available.
With solid cabin tech, the 2014 Chevrolet Cruze Diesel competes well with compact sedans and gets stellar fuel economy, but high initial cost and the price of diesel eat into the savings.
The 2014 BMW 328d xDrive Sports Wagon combines 40+ mpg diesel efficiency, the flexibility of a wagon, and the thrills of a driver's car.
The 2014 Volkswagen Jetta TDI offers basic transportation at a bargain and an excellent engine, but techies will want to hold off for the improved 2015 model.
Despite some very minor quibbles, the 2014 BMW 535d xDrive delivers exceptional quality and feature content on all fronts, from online cabin tech to fuel economy to driving satisfaction.
The 2014 Audi A7 TDI includes some of the best connected tech available today in an automobile, and those inclined to put up with a few diesel drivetrain quirks will be rewarded with significantly higher fuel economy than from the gasoline equivalent.
Featuring excellent fuel economy and a generally comfortable and easy-driving character, the 2013 Mercedes-Benz GLK250 makes for a useful all-around vehicle, good for the daily commute and family road trips.
Volkswagen's new hybrid system in the 2013 Jetta is a winner, delivering good driving characteristics and excellent fuel economy, but the cabin tech lacks features for a car in this price range.
For the 2014 model year, Audi pours its 3-liter diesel engine into the high-tech A7, giving it average fuel economy around 30 mpg.
Mercedes has been making a diesel version of the SLK for some time now, so I set about finding out whether a diesel sports car can actually be entertaining.
Can a sports car with a diesel engine still be called a sports car? We nabbed the keys to Mercedes' diesel SLK and found out.