23 MPG combined for the 2025 Lexus RC 350 3.5L V6 means it sips fuel at a rate that is entirely predictable for a naturally-aspirated, six-cylinder luxury sports coupe. This isn’t a vehicle engineered for Prius-level efficiency, nor is it a gas-guzzling muscle car. It occupies a distinct niche, catering to buyers who prioritize a blend of accessible performance, unflappable reliability, and an undeniably premium experience, all without venturing into the stratospheric costs often associated with its European rivals. These individuals appreciate the refined surge of a well-balanced V6 over the punchy, but often less linear, delivery of a turbocharged four-cylinder. They’re not cross-shopping hardcore track machines or hyper-efficient commuter pods; their focus is on a daily driver that can also deliver an engaging canyon carve.

City and highway performance

The EPA rates the 2025 Lexus RC 350 at 20 MPG in city driving and a more relaxed 28 MPG on the highway. The 20 MPG city figure is a realistic reflection of a 3.5-liter V6 coupled with a traditional automatic transmission, even a well-sorted 8-speed like the S8 found in the RC 350. Stop and go traffic, with its frequent accelerations and decelerations, inherently impacts larger displacement engines more significantly than their smaller, often turbocharged counterparts. However, the RC 350’s target demographic accepts this number because they understand that the smooth, linear power delivery and the satisfying exhaust note in urban environments come at a modest penalty at the pump. When the road opens up, the 28 MPG highway figure demonstrates the efficiency gains of cruising at steady speeds while the 3.5L 6-cyl engine operates within its optimal efficiency band. The well-calibrated automatic transmission minimizes hunting for gears, contributing to the respectable highway performance.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,500 for the 2025 Lexus RC 350. This figure is based on an assumed 15,000 miles driven per year, split between 45% highway and 55% city driving, and using national average fuel prices. It represents a standardized metric for comparison, allowing prospective buyers to understand the projected yearly expenditure solely on fuel for this vehicle. For buyers of the RC 350, this $2,500 figure is rarely a deal-breaker. They prioritize the premium ownership experience, the distinctive styling, and the proven reliability over squeezing every last penny out of their fuel budget. They’ve made a considered investment in a luxury coupe, and the annual fuel cost aligns with their expectations for a vehicle in this segment.

Real-world expectations

Real-world fuel economy for the 2025 Lexus RC 350 typically hovers very close to the official EPA estimates, assuming a reasonably balanced driving style. Lexus powertrains are renowned for their consistency and predictability. Drivers who spend a significant amount of time in heavy urban congestion will likely see figures closer to the 20 MPG city rating, or even slightly below if their driving is particularly aggressive. Conversely, those with predominantly highway commutes or who tend to maintain steady speeds on less congested roads will find themselves comfortably hitting or even marginally exceeding the 28 MPG highway figure. The naturally aspirated 3.5L V6 is less susceptible to dramatic swings in efficiency based on driving style compared to many turbocharged engines, which can experience substantial drops when pushed hard. The RC 350 buyer expects this linearity; they’re not looking for a hyper-efficient car, nor are they anticipating a fuel-thirsty monster. They appreciate its honest and predictable performance at the pump, a direct result of Lexus’s engineering philosophy.

How it compares

In its competitive set, the 2025 Lexus RC 350’s fuel economy holds its own, often performing similarly or even surpassing some rivals. Consider the BMW 430i Coupe, often cross-shopped for its similar premium coupe aspirations but with a turbocharged four-cylinder engine. The 430i typically achieves around 28 MPG combined (25 city / 34 highway). While the BMW boasts superior highway figures, the RC 350’s V6 often provides a more satisfying and refined power delivery, a trade-off many Lexus buyers readily accept. An Audi A5 Coupe (2.0L TFSI quattro) manages roughly 27 MPG combined (24 city / 31 highway), again with a turbocharged four-cylinder. For buyers who refuse to consider anything but a six-cylinder, the comparison shifts. A Genesis G70 3.3T, for example, a direct competitor in terms of engine configuration, typically yields around 21 MPG combined (18 city / 27 highway), placing the RC 350 in a more favorable light for efficiency while still offering a naturally aspirated V6. The RC 350’s buyer values the smooth, proven qualities of the Lexus V6, and the RC MPG across all years reflects a consistent performance. When examining all Lexus fuel economy data, the RC 350 fits perfectly within the brand’s performance and efficiency profile for its segment.

Tips to maximize efficiency

Maintaining consistent throttle input is key to maximizing the efficiency of the RC 350’s 3.5L V6. Avoid aggressive acceleration and sudden braking, as these actions waste fuel and put unnecessary strain on the powertrain. The car rewards a smooth, measured approach, allowing the S8 automatic transmission to operate in its most efficient range.

Regular maintenance, as outlined in your owner’s manual, is crucial. Ensuring proper tire pressure, clean air filters, and timely fluid changes all contribute significantly to the engine running at its peak efficiency. Neglecting these basic items can subtly, but consistently, degrade your overall MPG.

For highway driving, using cruise control whenever appropriate can help maintain a steady speed and prevent minor, unconscious speed fluctuations that eat into fuel economy. The RC 350’s adaptive cruise control is particularly effective here, helping to maintain efficient spacing and speed without driver intervention.

Avoid carrying unnecessary weight in the trunk or cabin. While individual items might seem negligible, collectively they increase the vehicle’s mass, requiring more energy to move. Removing items that aren’t regularly used can offer a small, but measurable, improvement in fuel efficiency.

In colder climates, plan your trips efficiently. Multiple short trips from a cold start consume more fuel than a single, longer trip where the engine reaches its optimal operating temperature. Combining errands into one outing will allow the powertrain to run more efficiently once warmed up.