20 MPG combined isn’t going to win any fuel economy awards, but the 2015 Lexus LS 600h L isn’t built for efficiency. This is a rolling sanctuary of leather and wood, a V8-powered statement of quiet luxury. It’s a car for executives who prioritize quiet competence and unflappable composure over outright performance ,and for whom fuel costs are a relatively minor consideration.

City and highway performance

The LS 600h L achieves an EPA-estimated 19 MPG in the city and 23 MPG on the highway. These figures reflect its hybrid powertrain, which uses an electric motor to add power to the 5.0-liter V8, especially at lower speeds. While the V8 provides effortless acceleration and power for highway cruising, the electric motor lightens the engine’s workload during stop-and-go urban driving, helping to eke out incremental gains in fuel efficiency. Keep in mind this is still a large, heavy sedan, and physics ultimately dictates its fuel consumption.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Lexus LS 600h L at $2,900. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, and assumes current national average fuel prices. Your actual fuel costs may vary depending on your driving habits, location, and fluctuating gas prices.

Real-world expectations

While the EPA estimates provide a useful benchmark, real-world fuel economy can often differ. Drivers who frequently accelerate hard or spend a lot of time in heavy traffic may see lower MPG figures than the official ratings. Conversely, those who adopt a gentler driving style and spend more time on the open road might achieve slightly better fuel economy. Weather conditions also play a role. Cold weather can reduce hybrid battery efficiency. expect to see numbers close to the EPA estimates. The 20 MPG combined is a reasonable average for this unique vehicle.

How it compares

In the realm of full-size luxury sedans, the LS 600h L’s fuel efficiency is a mixed bag. Non-hybrid competitors such as the V8-powered BMW 750i (17 MPG combined) and Mercedes-Benz S550 (20 MPG combined) offer similar, or even slightly better, mileage in some cases despite lacking hybrid assistance. The advantage of the Lexus, however, is in its whisper-quiet operation and smooth power delivery, especially around town. Those seeking improved fuel economy in a similar package could consider the Audi A8 3.0T (22 MPG combined), but it lacks the LS 600h L’s unique hybrid drivetrain and considerable presence. To review all Lexus fuel economy data, browse our model listings. For additional insight, explore LS MPG across all years.

Tips to maximize efficiency

Take it easy on the accelerator. The LS 600h L’s hybrid system is designed to maximize efficiency during gentle acceleration and cruising. Avoid stomping on the gas pedal unless you absolutely need to and allow the electric motor to contribute more to propulsion.

Use cruise control whenever possible, especially on the highway. Maintaining a constant speed can significantly improve fuel economy by preventing unnecessary acceleration and deceleration. This system uses the hybrid powertrain optimally.

Keep your tires properly inflated. Under-inflated tires increase rolling resistance, which reduces fuel efficiency. Check your tire pressure regularly and inflate them to the recommended pressure listed on the sticker in your driver’s side doorjamb.

Avoid unnecessary idling. If you’re stopped for more than a minute or two, turn off the engine. The LS 600h L’s hybrid system allows for smooth restarts, and idling wastes fuel needlessly.