The 2018 Subaru Legacy is available as a 4-door, 5-seat sedan. Starting at $22,195, the 2018 Subaru Legacy 2.5i is powered by a 2.5L , 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 2018SubaruLegacy3.6R Limited , priced at $ 31,945 , is powered by a 3.6L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 28-mpg on the highway.