The 2021 Audi TT is available as a 2-door, 4-seat coupe. Starting at $53,900, the 2021 Audi TT quattro Roadster is powered by a 2.0L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 23-mpg in the city and 31-mpg on the highway. The top of the line 2021 Audi TT quattro Coupe, priced at $49,800, is powered by a 2.0L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 23-mpg in the city and 31-mpg on the highway.