Like it or not, high gas prices are here to stay. Naturally, this uncomfortable reality has begun shaping our vehicle purchases. Mighty gas-chugging SUVs aren't the runaway sales titans they once were. In this revised landscape, the new heroes are perfectly ordinary hybrids and four-cylinder subcompacts, revered not for their looks or quickness, but rather, their frugality. If you're in the market for one of these models, you're in luck. We've put together a list of the 10 most fuel-efficient sedans currently sold in the U.S.