The 2006 Audi A3 is available as a 4-door, 5-seat hatchback. Starting at $24,740, the 2006 Audi A3 (M6) FrontTrak FrontTrak is powered by a 2.0L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 24-mpg in the city and 32-mpg on the highway. The top of the line 2006AudiA3quattro quattro , priced at $ 33,980 , is powered by a 3.2L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 27-mpg on the highway.