18 MPG combined makes the 2025 Lexus LC 500 Convertible a luxury grand tourer first and foremost, a machine engineered to deliver a blend of sensory pleasure and effortless performance, with fuel economy residing far down the list of priorities for its owner. This is not a vehicle purchased for its low fuel consumption, but rather for the symphonic roar of its naturally aspirated V8, the elegance of its silhouette, and the sheer joy of top-down motoring. The LC 500 Convertible represents a deliberate choice for those who value emotion and craftsmanship above all else, understanding that such a bespoke experience comes with its own unique metrics of efficiency.

City and highway performance

The 2025 Lexus LC 500 Convertible is rated at 15 MPG in city driving and 25 MPG on the highway. In city environments, stop-and-go traffic, the hefty curb weight, and the eager 5.0L V8 powertrain combine to keep consumption figures modest. This V8, a glorious anachronism in an increasingly turbocharged and electrified world, rewards engagement with a linear power delivery and an addictive exhaust note. Drivers will explore its upper reaches, a practice not conducive to stellar city mileage. Highway driving, however, allows the LC 500 Convertible to stretch its legs, settling into a comfortable cruise aided by its 10-speed automatic transmission. Here, the engine operates in its most efficient range, leading to a noticeable improvement in fuel economy without sacrificing the effortless passing power that defines a true grand tourer. Owners will appreciate the extended cruising range and the ability to cover significant distances with sublime comfort, even if they aren’t logging Prius-level numbers.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,200 for the 2025 Lexus LC 500 Convertible. This figure is based on a standard driver logging 15,000 miles per year, with an approximate 55% city / 45% highway driving split, using national average fuel prices. It’s a direct reflection of the 18 MPG combined rating and the premium fuel requirement for the high-compression naturally aspirated V8. For the individual purchasing an LC 500 Convertible, this annual fuel expense is typically a secondary consideration, easily absorbed into the overall cost of ownership of a six-figure luxury vehicle. The buyer understands that the joy derived from the rich engine sound and the exclusive driving experience far outweighs the cost at the pump. This $3,200 estimate serves as a clear indicator that the LC 500 Convertible is designed for exhilaration, not frugality, a trade-off readily accepted by its target demographic.

Real-world expectations

In real-world driving, LC 500 Convertible owners will likely see figures that closely align with the EPA estimates, particularly if they drive with a modicum of restraint. Enthusiastic driving, however, is almost an inevitability with this car, and pushing the powerful V8 will naturally lead to lower MPG numbers. The temptation to drop the top, select Sport S+ mode, and revel in the engine’s crescendo is powerful and often irresistible. Cruising on long highway stretches will yield the best results, potentially exceeding the 25 MPG highway rating if conditions are ideal and the driver employs a light foot. Conversely, persistent urban commuting, especially in heavy traffic, will keep the needle closer to the 15 MPG city figure. The true real-world expectation for LC MPG across all years is that it will be enjoyed as intended: passionately, making fuel stops a minor inconvenience rather than a major concern.

How it compares

When placed against its direct competitors, the 2025 Lexus LC 500 Convertible’s fuel economy holds its own, especially given its unique powertrain. A BMW M850i Convertible, for instance, with its twin-turbo V8, typically sees combined figures around 19-20 MPG. The Mercedes-AMG SL 55, also boasting a twin-turbo V8, achieves a similar 19 MPG combined. Even the Porsche 911 Carrera S Cabriolet, with its flat-six twin-turbo engine, hovers around 20 MPG combined. What sets the LC 500 Convertible apart, and what its buyer values, is that glorious naturally aspirated 5.0L V8. It’s an engine type that is rapidly disappearing, offering a connection and purity of sound that forced-induction alternatives struggle to replicate. The difference of a single MPG or two is negligible to the buyer prioritizing that specific, visceral experience. They aren’t cross-shopping a Mazda Miata; they are looking at other luxury, high-performance convertibles, and in that rarefied air, the LC 500 Convertible’s consumption is entirely commensurate with its mission and the sensory rewards it delivers. For more comparisons, review all Lexus fuel economy data.

Tips to maximize efficiency

Despite the LC 500 Convertible’s performance-oriented nature, several driving habits can slightly improve its fuel economy. Employing a smooth and progressive driving style, avoiding abrupt acceleration and heavy braking, will make a tangible difference. The 10-speed automatic transmission is designed to optimize ratios for efficiency, so letting it do its work in normal D mode will typically yield better results than frequent manual shifting.

Using the Eco driving mode, available through the drive mode selector, recalibrates throttle response and transmission shift points for greater efficiency. While it does temper the outright responsiveness, it can be beneficial for extended highway cruises or when moving through less demanding traffic conditions, providing a noticeable bump in MPG.

Regular maintenance, including keeping tires properly inflated and adhering to the recommended service schedule, ensures the engine and drivetrain are operating at their peak efficiency. A well-maintained vehicle not only runs better but also consumes less fuel, preserving the investment in this magnificent machine.

Consider lightening the load. While the LC 500 Convertible isn’t typically used for hauling cargo, removing any unnecessary items from the trunk or cabin can incrementally reduce weight. Less weight means less energy required to move the vehicle, contributing to marginal fuel savings over time.