1.6 TDI

German automaker Audi has launched a revised version of its A1 1.6 TDI with CO2 emissions of 99 grams per kilometer. Its 104-horsepower 1.6-liter diesel-burning engine, which is mated to a five-speed manual transmission, has undergone a slew of revisions that help slash the A1's CO2 emissions ...

If there's one thing green automotive journalists like, its a well-designed diesel vehicle from the Volkswagen group (just look here for proof). Given this recent history, it shouldn't be a surprise that the most efficient Golf ever was a ...