The 2018 Audi A3 is available as a 4-door, 5-seat sedan. Starting at $31,950, the 2018 Audi A3 FWD Sedan is powered by a 2.0L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 26-mpg in the city and 35-mpg on the highway. The top of the line 2018 Audi A3 Tech quattro quattro Cabriolet, priced at $42,750, is powered by a 2.0L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 22-mpg in the city and 30-mpg on the highway.