Audi offers a range of smaller products around the world, but the A3 is the smallest and least expensive model for sale in the U.S. This conservatively styled compact has four doors and a nearly vertical rear hatchback reminiscent of a small wagon. The styling pays dividends in utility with a cargo carrying capacity that rivals some larger wagons. The base engine in the A3 is a turbocharged gasoline engine rated at 200-bhp. Audi's famed quattro all-wheel-drive system is available on gas-powered models. What really sets the A3 apart is the availability of a diesel engine. When equipped with the 2.0l turbo diesel engine, the A3 carries an EPA rating of 30 MPG City, 42 MPG Highway. The A3 is a bit pricey, but includes a healthy list of standard equipment.