With gas prices still on the rise, lists of the most fuel-savvy cars are becoming almost as frequent as those dreaded trips to the pump. Most offer a litany of usual suspects like Toyota Prius, Honda Civic, and Ford Escape Hybrid. This year, however, the number of gas sippers has grown, making these lists longer and more interesting.

In addition to a weary rundown of 4 year-old hybrids, Forbes' roll of top 13 most fuel-efficient cars features new and, we dare say, rather unusual picks. Making its American debut, Smart Fortwo appears right at the top with the EPA-rated 33/41 mpg (city/hwy) and an estimated annual fuel cost of $1,555. Meanwhile, the newly redesigned Honda Accord rises to become the greenest midsize. No big surprise there. Less characteristically however, Mazda 5 (22/28 mpg) takes the top most efficient minivan spot, while the 4-cyl, 2.0-liter VW Passat (21/29 mpg) is named the most gas-savvy wagon. Things get even stranger when Forbes' green thirteen goes on to mention the Audi TT. Sure its 2.0L four-banger likes to rev and, at 23/31 mpg, the TT is certainly no gas hog. On the other hand, the "car takes only premium gas" and is not nearly as green as many of its counterparts.

If you find the high-revving, curve-loving Mini Cooper too small and the $35,000 TT too pricey, feel free to check our GoodCleanTech-featured guide to greenest vehicles for under $15,000.