With Audi A4 models only offered in four-cylinder form, they're now quite green and fuel-efficient. EPA highway ratings range up to 31 mpg in quattro all-wheel drive versions, and all models rate either 21 or 22 mpg in the city.
Surprisingly, the base front-wheel-drive, CVT model doesn't hold any gas-mileage advantage; so you might as well go with one of the quattro versions, which are a bit more fun to drive.
During our last longer test of an A4—a 2010 model—we averaged 31 mpg overall in mostly highway driving, including some suburban stop-and-go and spirited back-road two-laner stints. That's better than what we've seen from any rival model except the rear-wheel-drive-only BMW 335d.