The 2011 Honda Ridgeline is available as a 4-door, 5-seat regular side. Starting at $29,150, the 2011 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 2011HondaRidgelineRTL w/Leather/Navi , priced at $ 37,080 , 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.