22 MPG combined isn’t going to win any awards in 2020, but for the Lexus RX 350 L, the stretched, three-row version of Lexus’s popular midsize SUV, it’s a figure that many buyers are willing to accept. These are typically families who prioritize Lexus’s legendary reliability, a comfortable ride, and a well-appointed interior over outright fuel efficiency. The RX 350 L occupies a specific niche: those who need occasional (read: cramped) third-row seating without venturing into full-size SUV territory. For them, the fuel consumption is a tolerable trade-off.

City and highway performance

The EPA estimates for the RX 350 L break down to 19 MPG in the city and 26 MPG on the highway. The city figure reflects the reality of stop-and-go traffic, where the 3.5L V6 engine works harder to get the RX 350 L moving. Remember, this is not a lightweight vehicle; all that extra metal for the longer wheelbase and third row adds weight. The highway MPG is more respectable, showcasing the engine’s efficiency when cruising at steady speeds. The eight-speed automatic transmission (S8) helps here, keeping the engine in its optimal range. However, anyone routinely tackling long highway commutes with a full load of passengers and cargo should realistically expect MPG figures closer to the combined rating, perhaps even a touch lower.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Lexus RX 350 L at exactly $2,000. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, using the national average fuel prices at the time of calculation. Keep in mind that this is just an estimate, and your actual fuel costs may vary depending on your driving habits, the type of fuel you use (premium is recommended, but not required), and local fuel prices. Aggressive driving, frequent short trips, and sustained high-speed cruising will all increase your fuel bill, so driving style plays a significant role.

Real-world expectations

While the EPA provides a standardized benchmark, real-world MPG often deviates. RX 350 L owners often report figures hovering around the EPA estimates, with some reporting slightly lower numbers in mixed driving conditions and higher numbers in careful highway driving. Factors like weather, tire pressure, and vehicle maintenance all contribute to fuel economy. How you drive profoundly influences the final number; lead-footed drivers will see a noticeable drop, while those with a gentler approach can get closer to, or even slightly exceed, the EPA estimates. Given the vehicle’s size and weight, achieving significantly better MPG than the EPA estimates requires considerable effort.

How it compares

Compared to other three-row luxury SUVs, the RX 350 L’s fuel economy is generally competitive, but not class-leading. For example, the Acura MDX, a perennial rival, achieves around 22 MPG combined in its front-wheel-drive configuration. The Infiniti QX60 matches those figures. However, if fuel efficiency is a top priority, buyers might consider the Volvo XC90 T8 plug-in hybrid, which offers significantly better overall MPG, especially in city driving, when using its electric motor. Of course, the XC90 carries a higher price tag. The RX 350 L’s appeal lies in its balance of luxury, reliability, and acceptable fuel economy; buyers accept its MPG because they are prioritizing other aspects of the vehicle’s ownership experience, not to mention all all Lexus fuel economy data.

For comparison within the RX lineup, reviewing RX MPG across all years can provide a good perspective.

Tips to maximize efficiency

Avoid aggressive acceleration. The RX 350 L’s V6 engine delivers ample power when needed, but stomping on the gas pedal wastes fuel. Instead, adopt a smooth and progressive acceleration style, anticipating traffic flow and maintaining a steady speed whenever possible. The RX 350 L’s engine is responsive; you don’t need to floor it to get up to speed.

Maintain proper tire pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly and inflate them to the recommended levels, which can be found on a sticker inside the driver’s side door jamb or in the owner’s manual. This simple step can have a noticeable impact on fuel economy.

Minimize idling. Letting the engine idle for extended periods, such as when waiting in a parking lot or at a drive-through, wastes fuel. If you’re going to be stopped for more than a minute or two, it’s best to turn off the engine. Modern engines start quickly and efficiently, so restarting is generally more fuel-efficient than idling.

Reduce unnecessary weight. Carrying extra weight in the vehicle reduces fuel economy. Remove any unnecessary items from the trunk and passenger area, such as sports equipment, tools, or other bulky items that you don’t need on a daily basis. While the RX 350 L is designed to carry passengers and cargo, minimizing the load will help improve fuel efficiency.