26 MPG combined won’t win any hypermiling contests, but it’s an acceptable number for the 2018 Lexus LS 500h AWD. This isn’t a car purchased to chase fuel efficiency records. This is a flagship luxury sedan, designed for quiet comfort, effortless performance, and a badge that broadcasts success. The hybrid powertrain is more about refinement and instant torque than outright economy. Buyers in this segment prioritize smooth operation and cutting-edge technology; the reasonable MPGs are a bonus, not the primary draw.

City and highway performance

The EPA estimates the 2018 Lexus LS 500h AWD at 23 MPG in the city and 31 MPG on the highway. The city figure reflects the hybrid system’s ability to run on electric power alone at lower speeds and during stop-and-go driving, maximizing efficiency where a traditional gasoline engine would be at its worst. The 31 MPG highway rating indicates the LS 500h’s ability to cruise comfortably and efficiently on long journeys, using Atkinson-cycle combustion for the gasoline engine when under light load. The smooth-shifting automatic transmission (AV-S10) also optimizes fuel economy on the open road.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Lexus LS 500h AWD 3.5L 6-cyl at $2,250. This figure is based on driving 15,000 miles per year, with a fuel price that reflects the national average price for premium gasoline, which is recommended for optimum performance and longevity. Keep in mind that your actual fuel costs will vary depending on your driving habits, local fuel prices, and the percentage of city versus highway driving.

Real-world expectations

While the EPA figures provide a standardized benchmark, real-world fuel economy will vary. An owner predominantly driving in congested urban areas with aggressive acceleration can expect to see numbers closer to or even slightly below the 23 MPG city rating. Conversely, a driver who primarily takes long highway trips at moderate speeds might achieve numbers exceeding the 31 MPG highway estimate, especially with the careful use of cruise control and gentle throttle inputs.

How it compares

The LS 500h’s efficiency stands up reasonably well to its competitors, though it’s not the segment leader. The non-hybrid BMW 740i xDrive, with its turbocharged inline-six, achieves around 24 MPG combined. The Mercedes-Benz S560 4MATIC, with its powerful V8, lands in the low 20s. The now discontinued Cadillac CT6 Plug-In Hybrid offered better city mileage (25 MPG) but a similar combined figure to the Lexus. See all Lexus fuel economy data. The Lexus’ competitive advantage lies in its reputation for reliability and lower maintenance costs, which can offset the slightly higher fuel costs compared to some rivals. Potential owners might also look at LS MPG across all years. These buyers know that they are prioritizing smoothness, comfort, and Lexus’ sterling reputation in reliability, but they also appreciate that they are not sacrificing too much at the pump.

Tips to maximize efficiency

Gentle acceleration is key to maximizing fuel economy in the LS 500h. The electric motor provides instant torque, so there’s no need to aggressively push the accelerator pedal. Smooth, gradual acceleration will keep the gasoline engine from activating unnecessarily and help maintain electric-only operation for longer periods.

Use the car’s drive mode selector. The “Eco” mode optimizes various vehicle settings, such as throttle response and air conditioning, to prioritize fuel efficiency. While it might slightly reduce performance, it can make a difference in fuel consumption, especially during city driving.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressures regularly and inflate them to the recommended levels, which can be found on the sticker inside the driver’s side doorjamb.

Reduce unnecessary weight. Carrying excessive cargo in the trunk adds weight to the vehicle, which increases fuel consumption. Remove any items that you don’t need to carry regularly to improve fuel efficiency.