The 2006 Subaru Impreza is available as a 4-door, 5-seat sedan. Starting at $18,295, the 2006 Subaru Impreza 2.5i (M5) Sedan is powered by a 2.5L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 22-mpg in the city and 29-mpg on the highway. The top of the line 2006SubaruImprezaWRX Limited w/Beige Interior (A4) Sedan , priced at $ 28,495 , is powered by a 2.5L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 26-mpg on the highway.