The 2015 Audi TT is available as a 2-door, 4-seat coupe. Starting at $43,350, the 2015 Audi TT quattro Roadster 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 31-mpg on the highway. The top of the line 2015 Audi TT quattro Coupe, priced at $40,350, 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 31-mpg on the highway.