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GREEN | 7 out of 10
Audi A6 (four-cylinder): 25/33 mpg
The V6, for example, is up 1 mpg city and 2 mpg highway compared to 2010 models.
Fuel economy, though, looks good for a car in this class. EPA ratings are 19 mpg city and 28 highway compared with 18 and 26 for the previous A6 3.0T Quattro. We averaged 23 over the course of our two-week test.
Car and Driver
The 2013 Audi A6 returns reasonably good gas mileage whether it's equipped with the turbocharged four-cylinder engine in A6 2.0T or the supercharged V-6 in A6 3.0T models.
In front-wheel-drive 2.0T models, you'll have to endure Audi's continuously variable transmission to get the best 25/33-mpg ratings. But in 2013, for the first time, Audi is offering 2.0T models in quattro all-wheel-drive guise, with the eight-speed automatic. Those models earn 20 mpg city, 30 highway--1 or 2 mpg better than the 3.0T.
But even with the 3.0T and quattro, it's not bad; the supercharged, direct-injected V-6 powerplant and its standard all-wheel drive deliver 19/28 mpg.Otherwise, the A6 doesn't quite hit the high-mileage mark reached by some of its rivals, as there are no hybrid or diesel models. They're on the way, however, as soon as next year.
With no hybrid or clean-diesel option, as of yet, the 2013 Audi A6 and S6 lineup isn't quite as green as rival luxosedans.