The NX300h’s Atkinson-cycle 2.5-liter four-cylinder engine assisted by an electric motor is essentially the Lexus ES300h powertrain (unless you opt for all-wheel drive, which adds a second motor for the rear axle). Strapping our test gear to a front-wheel-drive NX300h, we received relatively good news at the track. It beat Lexus’s performance estimate by 0.8 second, hitting 60 mph in 8.3 ticks.