Getting 30 MPG combined from a V6-powered, all-wheel drive luxury SUV used to be unheard of. The 2018 Lexus RX 450h manages exactly that, delivering impressive fuel efficiency without sacrificing the smooth power and quiet refinement that Lexus buyers expect. This isn’t a sports SUV, but it is a supremely comfortable and reliable choice for those who want to save gas and enjoy a luxurious driving experience. The RX 450h is built for suburban streets and highway cruising, not canyon roads, and its efficiency reflects that design.

City and highway performance

The EPA numbers for the 2018 RX 450h AWD show its hybrid powertrain performs best in cities. The 31 MPG city rating benefits from regenerative braking and electric-only driving at lower speeds, typical of stop-and-go traffic. On the highway, the RX 450h gets a respectable 28 MPG. While not as good as the city figure, it’s important to remember that this is an all-wheel drive vehicle with a traditional V6 engine aided by electric motors. The hybrid system increases overall efficiency, but its impact is greatest where it can recapture and reuse energy most often.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Lexus RX 450h AWD at $1,950. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, and using the national average fuel price at the time of calculation. It’s a useful way of comparing the RX 450h’s running costs to other vehicles. Individual fuel costs will vary based on driving habits, local fuel prices, and the city/highway driving mix. But the $1,950 annual cost is a helpful point of reference for prospective buyers considering the financial effects of ownership. See all Lexus fuel economy data to see how it compares against other models.

Real-world expectations

While the EPA’s numbers give a standard comparison, real-world MPG can differ. However, the RX 450h’s hybrid system tends to deliver consistently good fuel economy, and many owners report numbers close to the EPA estimates. Aggressive driving, frequent short trips in very cold weather, and consistently high speeds can decrease MPG. A gentle driving style and attention to the hybrid system’s feedback can help drivers achieve or exceed the EPA’s estimates. The RX 450h rewards smooth acceleration and anticipatory braking, offering visual cues on the dashboard to help drivers minimize gas consumption.

How it compares

The RX 450h’s fuel economy makes it competitive in the luxury SUV segment. The gasoline-only RX 350 AWD gets just 22 MPG combined. The Acura MDX Sport Hybrid manages 27 MPG combined. A Volvo XC60 T8 Recharge plug-in hybrid offers higher MPGe figures when using its electric range, but requires charging to maximize those benefits. Its gasoline-only MPG is lower than the RX 450h’s. Buyers often like the RX 450h’s balance of fuel efficiency, luxury features, and Lexus’s reliability. They may accept a slightly more relaxed driving experience in exchange for lower running costs and a smoother ride. Compare RX MPG across all years to see fuel economy trends. The RX 450h is a strong choice for those seeking an efficient, comfortable luxury SUV.

Tips to maximize efficiency

Watch the hybrid system’s feedback. The RX 450h provides visual cues on the dashboard to indicate when the electric motor is engaged and when regenerative braking is active. Use a light touch on the accelerator and brake pedal to maximize these fuel-saving features. Smooth and gradual inputs are vital for efficient hybrid driving.

Use the “EV” mode for short trips. The RX 450h offers a dedicated electric vehicle mode that allows limited all-electric driving at low speeds. Use this mode for short errands or commutes when possible to minimize gasoline consumption. EV mode is most effective at lower speeds and over relatively short distances.

Keep tires properly inflated. Properly inflated tires reduce rolling resistance, which improves fuel economy. Check tire pressure regularly and inflate them to the recommended pressure listed on the sticker inside the driver’s side doorjamb. Even a few PSI low can negatively affect MPG.

Reduce weight and aerodynamic drag. Remove unnecessary items to decrease the weight, which can improve fuel efficiency. Avoid using roof racks or carriers when not needed, as they increase aerodynamic drag and reduce MPG. Reducing drag can make a difference over time.

Consider using the air conditioning only when needed. Using the air conditioning puts strain on the engine or hybrid system. When appropriate, use the fan or open windows to improve mileage.