21 MPG combined is not the Lexus LS 500 AWD’s strongest selling point, it’s not intended to be. This is a flagship luxury sedan, a statement of success and refinement. Buyers in this category prioritize opulence, a smooth ride, and advanced technology far above squeezing out every last mile per gallon. The LS 500 isn’t trying to be a fuel-sipping hybrid; it’s projecting an image of effortless power and unwavering comfort, and that comes with a certain thirst.

City and highway performance

The EPA estimates the 2018 Lexus LS 500 AWD at 18 MPG in the city and 27 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the LS 500’s twin-turbocharged 3.4L V6 frequently works to overcome its considerable weight. The engine’s smooth power delivery is appreciated in these situations, even if it does come at a cost. On the open road, the LS 500 truly shines. Its 10-speed automatic transmission allows the engine to cruise at low RPMs, contributing to the respectable highway fuel economy figure. The ride is supremely comfortable, making long distances feel effortless. These numbers reflect the delicate balance built into this car, more efficiency is available elsewhere within all Lexus fuel economy data.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Lexus LS 500 AWD at $2,750. This figure is based on driving 15,000 miles per year and using national average fuel prices. Remember that your actual fuel costs will vary depending on your driving habits, the type of fuel you use, and where you live. Those who frequently drive in heavy traffic or have a lead foot will likely exceed this estimate, while those who predominantly drive on the highway and practice efficient driving techniques may spend less filling up the tank. This dollar figure is a useful benchmark, but individual expenses will almost certainly differ from this estimate.

Real-world expectations

While the EPA estimates offer a standardized comparison tool, real-world fuel economy often differs. Many LS 500 owners report slightly lower combined MPG figures, often hovering around 19-20 MPG, especially if their driving is primarily city-based. Aggressive acceleration and frequent use of the car’s many power-hungry features can also negatively impact fuel consumption. However, drivers prioritizing smooth acceleration and highway miles might see figures closer to the EPA’s estimates or even slightly better.

How it compares

Against its competitors, the 2018 Lexus LS 500 AWD’s fuel economy is competitive within the segment, but not class-leading. The BMW 740i xDrive achieves an EPA-rated 24 MPG combined, while the Mercedes-Benz S450 4MATIC manages 23 MPG combined. The Audi A8 offers similar real-world efficiency as the Lexus. What the LS 500 concedes in outright fuel economy, it makes up for in reliability and a reputation for lower long-term maintenance costs. The decision often comes down to a trade-off: some prioritize a few extra MPG, while others value the Lexus’s proven dependability and refined driving experience. It’s important to consider LS MPG across all years to understand the Lexus fuel economy trend.

Tips to maximize efficiency

The LS 500’s twin-turbo V6 responds well to smooth acceleration. Avoiding sudden bursts of speed and maintaining a steady throttle position will significantly improve fuel economy, particularly in urban environments. The car’s adaptive cruise control can be a valuable tool on the highway, helping to maintain a consistent speed and minimize unnecessary acceleration and braking.

Ensure your tires are properly inflated to the recommended pressure listed on the driver’s side doorjamb. Underinflated tires increase rolling resistance, forcing the engine to work harder and reducing fuel economy. Regularly checking and adjusting your tire pressure is a simple but effective way to save fuel.

The LS 500 is equipped with a variety of electronic features that consume power, some without obvious benefits. Limiting the use of energy-intensive features like seat heaters and high-volume audio can slightly improve fuel economy, especially on shorter trips.

Consider using the LS 500’s drive mode selector. The “Eco” mode optimizes engine and transmission settings for maximum fuel efficiency. While it might slightly dampen the car’s responsiveness, it can be a useful option for long highway drives or when fuel economy is a primary concern.