23 MPG combined isn’t going to win any awards, but for the 2019 Lexus LS 500 and its purpose, it’s an acceptable compromise. This isn’t a car purchased for its frugality. It’s bought for its smooth power, quiet ride, and reputation for bulletproof reliability. Buyers in this segment prioritize a cossetting driving experience over outright fuel efficiency, and the LS 500 delivers that.

City and highway performance

The EPA estimates suggest 19 MPG in the city and 30 MPG on the highway. The discrepancy between these numbers highlights the LS 500’s sweet spot: comfortable, effortless long-distance cruising. The 3.4L twin-turbo V6 doesn’t have to work hard to maintain highway speeds, and the 10-speed automatic transmission keeps the engine in its most efficient range. Stop-and-go city driving, however, takes a toll, negating the benefits of the advanced powertrain. Owners who primarily operate in urban environments will likely see fuel economy closer to the lower end of the spectrum, while those who frequently undertake longer journeys can expect to approach, or even slightly exceed, the 30 MPG highway figure.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2019 Lexus LS 500 at $2,500. This figure is based on driving 15,000 miles per year, with a 55% city and 45% highway driving split, and assumes the use of regular unleaded fuel at national average prices. Individual fuel costs will vary depending on driving habits, local fuel prices, and the specific blend of fuel used. For example, aggressive driving or frequent short trips can significantly increase fuel consumption, while consistent highway driving at moderate speeds can lower it. See LS MPG across all years here.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy often deviates. LS 500 owners frequently report numbers in line with, or slightly below, the EPA estimates in mixed driving. Factors such as traffic conditions, driving style, and even tire pressure significantly influence fuel consumption. The LS 500 encourages a relaxed driving style, which can help to improve fuel economy. However, the readily available power from the twin-turbo V6 can be tempting to use, especially when merging onto highways or overtaking other vehicles. Resist the urge to bury your foot in the accelerator and you’ll be rewarded with better fuel efficiency.

How it compares

The LS 500 exists in a competitive segment, and its fuel economy stacks up differently against its rivals. The BMW 740i, with its turbocharged inline-six, achieves a slightly better 25 MPG combined. The Mercedes-Benz S560, packing a turbocharged V8, manages only 20 MPG combined. Even the Audi A8, with its mild-hybrid system, lands right around the same 23 MPG. The LS 500’s fuel economy isn’t a standout strength, but it’s reasonably competitive. For buyers cross-shopping these flagship sedans, the LS 500’s legendary reliability and typically lower maintenance costs might outweigh a minor difference in MPG. See all Lexus fuel economy data.

Tips to maximize efficiency

The LS 500’s 10-speed automatic transmission is designed to keep the engine operating at its most efficient RPM range. Avoid aggressive acceleration, especially from a standstill, to allow the transmission to smoothly shift through the gears and minimize fuel consumption. Gradual acceleration is key to optimizing fuel efficiency.

Ensure your tires are properly inflated and maintain them at the recommended pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly, especially during temperature changes, as pressure can fluctuate.

Regular maintenance plays a critical role in maintaining optimal fuel efficiency. Ensure your engine air filter is clean, and follow Lexus’ recommended service schedule for oil changes and other maintenance items. A well-maintained engine runs more efficiently and consumes less fuel.

The LS 500 benefits from a relatively slippery aerodynamic profile, but carrying unnecessary weight in the trunk or cabin increases fuel consumption. Remove any items you don’t need to reduce the overall load on the vehicle, especially for drivers who will usually be alone.

Use cruise control on the highway whenever possible. Maintaining a consistent speed helps to minimize unnecessary acceleration and deceleration, leading to improved fuel economy. However, be mindful of traffic conditions and disengage cruise control when needed to maintain safe following distances.