22 MPG combined is what you get for the extended wheelbase and occasional seven-passenger capacity of the 2018 Lexus RX 350 L. While not class-leading, this reflects moving a vehicle of this size and weight for its intended purpose. The RX 350 L is for families who want luxury, reliability, and a smooth, quiet ride. Fuel economy is a consideration, but often less important than these other features.

City and highway performance

The RX 350 L’s EPA ratings are 19 MPG in the city and 26 MPG on the highway. The lower city figure is typical for a naturally aspirated V6 engine in a vehicle that often stops and starts. The engine, while smooth and responsive, needs to work harder to move the RX 350 L from a standstill compared to a lighter, smaller vehicle. The 26 MPG highway rating is respectable, reflecting the efficiency of the eight-speed automatic transmission and relaxed engine speeds when cruising. Drivers should maintain consistent speeds, as accelerating to pass other cars can quickly lower fuel efficiency on the open road.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Lexus RX 350 L at $2,000. This is based on driving 15,000 miles per year and using national average fuel prices. Fuel costs will vary based on driving habits, local fuel prices, and city versus highway driving. Drivers who primarily drive their RX 350 L in cities will probably spend more than this, while those who often drive long distances on highways should spend less. Keep these factors in mind when budgeting for vehicle ownership.

Real-world expectations

The EPA provides a benchmark, but real-world MPG for the RX 350 L varies. Drivers who often carry passengers or cargo, or who accelerate quickly, frequently report numbers below the EPA estimates. However, those who accelerate smoothly, maintain consistent speeds, and minimize idling may see results closer to, or even slightly above, the official numbers. Tire pressure, weather, and even the type of fuel used can also affect fuel economy. Being aware of these factors helps drivers get the most out of their RX 350 L’s efficiency.

How it compares

Compared to its competitors, the RX 350 L’s fuel economy is about average. The Acura MDX, another popular three-row luxury SUV, also gets an EPA-rated 22 MPG combined in its non-hybrid version. The Infiniti QX60 gets that same figure, making it similar to the RX 350 L in fuel economy. The Volvo XC90, in its T5 version, gets slightly better mileage, often reaching 24 MPG combined, but with a different engine than the smooth V6 in the Lexus. The hybrid RX 450h offers much better fuel economy (30 MPG combined), but costs more. For consumers who want to save on gas above all else, the RX 450h is worth considering, but those who want the V6 power may not like that tradeoff. Remember to browse all Lexus fuel economy data to get a broader view.

Tips to maximize efficiency

The RX 350 L, like any vehicle, benefits from good driving habits. Avoid accelerating and braking quickly, as this really hurts your fuel economy. Accelerating slowly helps the engine run more efficiently, and watching traffic minimizes hard braking.

Regular maintenance is important for fuel efficiency. Make sure your tires are properly inflated, as underinflated tires create more rolling resistance. Also, change the engine oil and air filter as recommended by the manufacturer to keep the engine running smoothly.

Avoid idling when you can. Idling uses fuel without going anywhere, and it’s often not needed. If you’re going to stop for more than a minute or two, turn off the engine. Modern vehicles restart quickly, minimizing wear and tear.

Consider using cruise control on long drives. Cruise control helps keep a consistent speed, which means you don’t have to constantly adjust the accelerator. This improves fuel economy on the open road. Learn more about RX MPG across all years to see how consistent these tips have helped.