The 2006 Acura TSX is available as a 4-door, 5-seat sedan. Starting at $27,890, the 2006 Acura TSX (A5) is powered by a 2.4L , 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 2006AcuraTSXWith Navigation (M6) , priced at $ 29,890 , is powered by a 2.4L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 21-mpg in the city and 30-mpg on the highway.