The 2013 Scion xB is available as a 4-door, 5-seat wagon. Starting at $16,800, the 2013 Scion xB Base (M5) is powered by a 2.4L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 22-mpg in the city and 28-mpg on the highway. The top of the line 2013ScionxB10 Series (A4) , priced at $ 20,160 , 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 28-mpg on the highway.