The 2009 Honda Ridgeline is available as a 4-door, 5-seat regular side. Starting at $28,200, the 2009 Honda Ridgeline RT is powered by a 3.5L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 20-mpg on the highway. The top of the line 2009HondaRidgelineRTS , priced at $ 31,305 , is powered by a 3.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 20-mpg on the highway.