The 2018 Audi TT is available as a 2-door, 4-seat coupe. Starting at $47,450, the 2018 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 30-mpg on the highway. The top of the line 2018AudiTTquattro Coupe , priced at $ 43,950 , 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 30-mpg on the highway.