Light Front, Runs and Drives, Airbags Good., , Like its non-hybrid RX 350 sibling, the RX 400h luxury SUV gets few changes for 2008. A hybrid-electric drivetrain yields EPA-estimated gas mileage in the mid-20s, a respectable gain over the RX 350s 20-mpg combined rating. Competitors to the RX include the Mercedes-Benz M-Class and Lincoln MKX.