The 2006 Acura RSX is available as a 2-door, 4-seat coupe. Starting at $21,225, the 2006 Acura RSX Base (A5) is powered by a 2.0L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 25-mpg in the city and 34-mpg on the highway. The top of the line 2006AcuraRSXType S (M6) , priced at $ 23,845 , is powered by a 2.0L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 23-mpg in the city and 31-mpg on the highway.