The 2018 Toyota Avalon is available as a 4-door, 5-seat sedan. Starting at $33,500, the 2018 Toyota Avalon XLE is powered by a 3.5L , 6 -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 2018ToyotaAvalonLimited , priced at $ 41,300 , is powered by a 3.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 30-mpg on the highway.