The 2006 Volvo S80 is available as a 4-door, 5-seat sedan. Starting at $37,585, the 2006 Volvo S80 FWD is powered by a 2.5L , 5 -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 2006VolvoS80AWD , priced at $ 39,360 , is powered by a 2.5L , 5 - cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 27-mpg on the highway.