The 2010 Dodge Avenger is available as a 4-door, 5-seat sedan. Starting at $20,230, the 2010 Dodge Avenger SXT is powered by a 2.4L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 30-mpg on the highway. The top of the line 2010DodgeAvengerExpress , priced at $ 21,230 , is powered by a 2.4L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 30-mpg on the highway.