The 2021 Acura RDX is available as a 4-door, 5-seat sport utility. Starting at $40,400, the 2021 Acura RDX Base AWD is powered by a 2.0LL , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 27-mpg on the highway. The top of the line 2021AcuraRDXPMC Edition AWD , priced at $ 51,000 , is powered by a 2.0LL , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 27-mpg on the highway.