21 MPG combined isn’t going to win any efficiency awards, but it’s the reality for the 2023 Lexus LS 500 AWD, a full-size luxury sedan built for quiet comfort and effortless power, not hypermiling. This figure reflects a blend of city and highway driving, acknowledging that the LS buyer prioritizes a plush ride and a hushed cabin over squeezing every last mile from each gallon of premium gasoline. They’re buying an experience, and fuel economy is simply a cost of admission.

City and highway performance

The EPA estimates 17 MPG in the city and 27 MPG on the highway for the all-wheel-drive Lexus LS 500. The city figure, as expected, takes a hit due to stop-and-go traffic where the twin-turbocharged 3.4L V6 works harder to move the LS 500’s considerable mass. The highway number is more respectable, reflecting the engine’s ability to cruise efficiently at consistent speeds. The 10-speed automatic transmission also plays a role, keeping the engine in its optimal power band. While 27 MPG isn’t exceptional, buyers seeking to maximize efficiency should consider carefully planning their longest trips.

Annual fuel cost

The EPA calculates that the 2023 Lexus LS 500 AWD will cost approximately $2,750 in fuel annually. This figure is based on driving 15,000 miles per year and using national average fuel prices. This is an estimate; your actual fuel costs will vary depending on your driving habits, location, and fluctuations in gasoline prices. This number is higher than many other vehicles, but the LS 500 buyer is likely less sensitive to these expenses than drivers of more economy-focused cars.

Real-world expectations

The EPA provides a standardized benchmark, but real-world fuel economy can deviate. Factors like aggressive driving, frequent short trips, and the use of air conditioning can all negatively impact fuel consumption. Similarly, gentle acceleration, consistent highway speeds, and proper tire inflation can help you achieve figures closer to, or even slightly exceeding, the EPA estimates. The LS 500’s driver-selectable modes can subtly affect MPG, with Eco mode prioritizing fuel efficiency over outright acceleration.

How it compares

Compared to its competitors, the 2023 Lexus LS 500 AWD occupies a middle ground in terms of fuel economy. The BMW 740i with all-wheel drive achieves a slightly better 25 MPG combined. The Mercedes-Benz S 500 4MATIC also typically delivers around 24 MPG combined, both outperforming the LS 500. However, the Audi A8, depending on the engine, is often closer to the LS 500’s numbers. This comparison is essential for buyers cross-shopping in this segment, as it highlights the relative fuel efficiency differences between these flagship sedans. If fuel economy is a primary concern, there are slightly better options available, but they may compromise on some of the LS 500’s unique strengths, like its legendary reliability and smooth ride.

Tips to maximize efficiency

Gentle acceleration is key. The LS 500’s twin-turbo V6 provides ample power, but using it judiciously, especially from a standstill, will significantly improve fuel economy. Avoid sudden bursts of speed and anticipate traffic flow to minimize unnecessary braking and acceleration. The LS is engineered for effortless cruising, and your fuel economy will reflect a smoother driving style.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and reducing fuel efficiency. Check your tire pressures regularly and inflate them to the manufacturer’s recommended levels, found on the door jamb sticker. This is a simple but effective way to boost MPG.

Use the drive modes. The LS 500 offers different drive modes, including an “Eco” mode that optimizes engine and transmission settings for fuel efficiency. While it might slightly reduce throttle response, it can make a noticeable difference in MPG, especially during city driving. Experiment with the different modes to find the best balance between performance and fuel economy for your driving style.

Minimize idling. Letting the engine idle for extended periods wastes fuel. If you’re stopped for more than a minute, consider turning off the engine. The LS 500 is equipped with a refined engine start-stop system for minimal disruption, and frequent use of the feature will significantly improve fuel economy, especially in stop and go traffic.

Regular maintenance is crucial. Keeping your LS 500 properly maintained, including regular oil changes and air filter replacements, ensures optimal engine performance and fuel efficiency. A well-maintained engine runs more efficiently, maximizing the MPG potential. You can find all Lexus fuel economy data on FuelEconomyHub, as well as specific LS MPG across all years.