18 MPG combined. That’s the headline number for the 2026 Lexus LC 500 Convertible, and for anyone considering this naturally aspirated V8 grand tourer, it’s not really a surprise, nor is it a deterrent. This is a car bought for its visceral experience, its exquisite design, and that magnificent 5.0L engine note. The fuel economy is merely a data point, an accepted consequence of indulging in one of the last great atmospheric V8s in a truly gorgeous package. Owners of an LC 500 Convertible are not cross-shopping it against a Prius; they’re cross-shopping it against a feeling, and that feeling comes with a certain thirst for premium unleaded.

City and highway performance

The EPA rates the 2026 Lexus LC 500 Convertible at 15 MPG in the city and 25 MPG on the highway. In city driving, that 5.0-liter V8, paired with the rapid-fire 10-speed automatic transmission, is a known quantity for its eagerness. Stop-and-go traffic work means constantly revving that engine, even slightly, to get its 471 horsepower moving, which inevitably impacts efficiency. The transmission works to keep the engine in its optimal power band, which, while beneficial for acceleration, isn’t always the most conservative on fuel. On the highway, however, the LC 500 Convertible stretches its legs more effectively. Cruising at consistent speeds, the 10-speed automatic can drop into its higher gears, letting the V8 lope along at lower RPMs. The aerodynamic profile, while elegant, isn’t overtly optimized for hyper-miling. Realistically, consistently achieving 25 MPG on the highway demands a disciplined right foot and flat, open stretches of road. Any spirited driving, which is practically guaranteed in this car, will quickly pull those numbers down.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,200 for the 2026 Lexus LC 500 Convertible. This figure is calculated based on driving 15,000 miles per year, split between city and highway driving, using an assumed national average fuel price. For the LC 500 Convertible owner, this $3,200 is simply another line item in the budget of luxury car ownership. It’s a modest sum compared to the initial purchase price, insurance, and maintenance costs associated with a vehicle of this caliber. Those who buy this car recognize that the cost of fuel is part and parcel of enjoying the engineering masterpiece under the hood. For a collector or enthusiast, this annual cost is a small price to pay for the aural and driving satisfaction the LC delivers.

Real-world expectations

In the real world, owners of the 2026 Lexus LC 500 Convertible will likely see numbers hovering closer to the 18 MPG combined figure, and often less, depending on how they choose to drive. This vehicle encourages spirited driving, and that 5.0L V8 is addictive to hear and feel when pushed. Punching the throttle, even for a moment, to revel in the exhaust note or to make a quick overtake, consumes fuel readily. Many owners use their LC Convertible as a weekend cruiser or for special occasions, meaning annual mileage might be less than the EPA’s 15,000-mile assumption, which would naturally lower the total annual fuel cost. However, for those who do put significant miles on it, especially if those miles are predominantly in congested city environments, don’t be surprised to see averages closer to the lower teens. The joy of the mechanical connection and the sheer theater of the LC 500 Convertible far outweighs any fuel economy concerns for its dedicated buyer base. This is a car for the individual who prioritizes experience over efficiency metrics.

How it compares

When considering the landscape of luxury grand tourer convertibles, the LC 500 occupies a unique niche due to its naturally aspirated V8. Competitors often lean towards forced induction, which can sometimes yield slightly better, though less characterful, fuel economy. Take, for instance, the Porsche 911 Carrera S Cabriolet. With its 3.0L twin-turbo flat-six, it achieves an EPA combined rating of 20 MPG (18 city/24 highway), offering a small edge in efficiency but a vastly different engine note and character. The BMW 850i xDrive Convertible, powered by a 4.4L twin-turbo V8, comes in at 20 MPG combined (17 city/24 highway), again, marginally better but with a distinct powertrain feel. Even the Mercedes-AMG SL 63 Roadster, with its potent 4.0L twin-turbo V8, manages 18 MPG combined (15 city/23 highway), essentially mirroring the LC’s numbers despite its twin-turbo setup. This comparison reveals that the LC 500 Convertible, despite its old-school naturally aspirated V8, holds its own in terms of fuel economy when pitted against its direct luxury convertible rivals. Buyers choosing the LC are doing so for its unique purity of sound and response, knowing that its MPG figures are competitive within its specific segment. For more on Lexus fuel economy, check out all Lexus fuel economy data.

Tips to maximize efficiency

While fuel economy isn’t the primary concern for most LC 500 Convertible owners, a few mindful driving habits can help optimize the numbers. Engaging “Eco Mode” through the drive mode selector will dull throttle response and adjust transmission shift points to favor efficiency. This mode is best suited for long, uninterrupted highway cruises where maximizing range might be a consideration, rather than for spirited backroad assaults.

Maintaining a smooth and consistent driving style is critical. Hard acceleration and abrupt braking are the biggest enemies of fuel efficiency, especially with a large V8 engine. Use the car’s substantial torque to gently accelerate rather than constantly revving the engine. The LC makes power effortlessly, so there’s often no need to push it vigorously for everyday driving.

Keeping the convertible’s tires properly inflated to the manufacturer’s recommended pressure can make a subtle but tangible difference. Under-inflated tires increase rolling resistance, forcing the engine to work harder. Check tire pressures regularly, particularly as temperatures change, to ensure optimal efficiency and handling.

Consider the weight you’re carrying. While the LC Convertible isn’t designed as a cargo hauler, removing unnecessary items from the trunk and cabin can slightly reduce the overall vehicle weight. For those who frequently visit tracks, lighter wheels or brake components can also contribute to a minor gain in efficiency, though the primary benefit is performance. You can also explore LC MPG across all years for more detailed information.

Finally, avoid excessive idling. If you find yourself waiting for extended periods, such as in a queued drive-thru or stopped with the engine running, it’s more fuel-efficient to turn the engine off. The LC 500 Convertible doesn’t feature an auto stop/start system standard, so manually turning it off helps conserve fuel during these stationary moments. Every little bit counts for those who want to get the best out of their beautiful open-top V8.