The 2016 Acura RLX is available as a 4-door, 5-seat sedan. Starting at $54,450, the 2016 Acura RLX w/Technology Package is powered by a 3.5L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 31-mpg on the highway. The top of the line 2016AcuraRLXWith Navigation , priced at $ 50,950 , is powered by a 3.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 31-mpg on the highway.