30 MPG combined. That’s the headline for the 2017 Lexus RX 450h AWD, a figure that immediately sets it apart within the luxury SUV segment. This isn’t a sporty crossover chasing lap times, or a reliable truck aimed at conquering off-road trails. This RX 450h is a quiet, comfortable, and efficient vehicle for buyers who prioritize fuel savings and a refined driving experience.

City and highway performance

The EPA estimates the RX 450h AWD achieves 31 MPG in the city and 28 MPG on the highway. This unusual split, where city MPG exceeds highway MPG, is typical of hybrid powertrains. The RX 450h’s electric motor handles much of the low-speed driving, regenerative braking captures energy that would otherwise be lost, and the gasoline engine shuts down completely during stop-and-go traffic. On the open highway, the gasoline engine takes on a greater role, leading to the slightly reduced MPG figure. These numbers hold up reasonably well in real-world driving, provided the driver avoids aggressive acceleration and excessive speeds.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2017 Lexus RX 450h AWD is $1,950. This figure is based on driving 15,000 miles per year and using national average fuel prices. Individual fuel costs will vary depending on driving habits and local gas prices, but this estimate provides a useful benchmark. Buyers considering alternative SUVs should carefully compare these fuel cost estimates, as differences of even a few MPG can translate to hundreds of dollars in savings per year.

Real-world expectations

While the EPA figures provide a standardized comparison, real-world fuel economy will always vary. Drivers who accelerate hard or who frequently drive in mountainous regions will likely see lower numbers. Owners who prioritize smooth acceleration, anticipate traffic stops, and maximize regenerative braking could potentially exceed the EPA estimates. Winter driving, with colder temperatures and increased use of accessories like heated seats, can negatively impact fuel economy.

How it compares

The RX 450h’s fuel economy positions it favorably against many of its competitors. The non-hybrid RX 350 AWD, for example, manages only 22 MPG combined. Several other luxury SUVs in this size range offer significantly worse economy. The Acura MDX SH-AWD is rated at 21 MPG combined, while the BMW X5 xDrive40i achieves a similarly unimpressive 23 MPG. Even some smaller crossovers, like the Audi Q5 45 TFSI Quattro, struggle to match the RX 450h’s 30 MPG combined rating, achieving only 25 MPG. The Lexus NX 300h does offer better fuel economy at 31 MPG combined, but is considerably smaller than the RX. Owners concerned about less gas, or those who simply value lower running costs, will find the RX 450h a good choice because of its fuel economy. See all Lexus fuel economy data here and RX MPG across all years here.

Tips to maximize efficiency

Use the “EV” mode for short trips at low speeds. This mode forces the RX 450h to operate solely on electric power, minimizing gasoline consumption. Be mindful of the battery’s charge level and the limitations of the electric motor, as it can feel underpowered during acceleration.

Practice smooth and gradual acceleration. The RX 450h’s hybrid powertrain is most efficient when the gasoline engine isn’t working hard. Avoid stomping on the accelerator and instead, gently ease into your desired speed. Monitor the power gauge on the instrument panel to stay within the “eco” range.

Anticipate traffic stops and coast whenever possible. By lifting off the accelerator early and allowing the RX 450h to coast, you maximize regenerative braking and recapture energy that would otherwise be lost as heat. This improves fuel economy and reduces wear and tear on the brakes.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate them to the recommended levels, which can be found on a sticker inside the driver’s side doorjamb.

Reduce unnecessary weight. Excess cargo places additional strain on the engine and reduces fuel efficiency. Remove any items from the trunk or cargo area that are not essential for your daily driving needs.