The 2004 Toyota Avalon is available as a 4-door, 5-seat sedan. Starting at $26,145, the 2004 Toyota Avalon XL w/Bucket is powered by a 3.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 29-mpg on the highway. The top of the line 2004ToyotaAvalonXLS w/Bench , priced at $ 30,505 , is powered by a 3.0L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 29-mpg on the highway.