Toyota Corolla

The 2011 Toyota Corolla is one of the best-selling compact sedans in the U.S. market. But its gas mileage isn't necessarily anything to write home about. The most fuel-efficient model is the one fitted with the 132-horsepower, 1.8-liter engine and a five-speed manual gearbox, a transmission many U.S. buyers will shun for an automatic. That five-speed manual Corolla is rated at 28 mpg city, 35 mpg highway, for a combined gas mileage rating of 31 mpg. Switching to the ancient four-speed automatic transmission with that same 1.8-liter engine, as most buyers do, brings the numbers down to 26 mpg...