22 MPG combined is not where the 2025 Lexus RC 350 AWD 3.5L 6-cyl makes its case, nor should it be. This is a car for the driver who prioritizes a naturally aspirated engine, all-wheel drive stability, impeccable build quality, and a deeply satisfying, albeit not blistering, driving experience, all wrapped in a distinctive coupe body. Fuel economy is simply a fact of ownership, not a primary motivator for someone choosing a car like this.

City and highway performance

The RC 350 AWD’s 19 MPG city rating reflects its substantial curb weight, the inherent friction losses of an all-wheel drive system, and the 3.5-liter V6’s strong displacement. This isn’t a four-cylinder turbo designed for maximizing stop-and-go efficiency; it’s a smooth, torque-rich engine built for refined power delivery, which inevitably comes with a thirst for fuel in urban environments. On the highway, the 26 MPG figure is more respectable. The 8-speed automatic transmission plays a crucial role here, allowing the engine to settle into low RPMs during sustained cruising, contributing to better efficiency once the car is up to speed. For the interstate hauler, 26 MPG is a perfectly acceptable number for a luxury sport coupe with all-wheel drive, especially one from a brand renowned for its reliability and long-term durability.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2025 Lexus RC 350 AWD 3.5L 6-cyl at precisely $2,650. This figure is derived assuming an average of 15,000 miles driven per year, split between city and highway conditions, and using national average fuel prices. For the RC 350 owner, this annual expenditure is often viewed as a reasonable operating cost for a premium vehicle. It provides a distinct blend of luxury, performance, and all-weather capability. It’s a pragmatic acceptance of the cost of admission for owning a car that delivers a specific, uncompromised experience. The buyer of this car isn’t typically cross-shopping it with pure economy cars; they’re looking at other luxury coupes with similar performance profiles.

Real-world expectations

Owners of the RC 350 AWD can realistically expect to achieve figures very close to the EPA estimates. Lexus engines are known for their consistent performance, and the 3.5L V6 is no exception. Aggressive driving in urban areas will naturally push the city MPG closer to the low teens, while disciplined highway cruising will occasionally see numbers nudge above the 26 MPG highway rating. The car’s character encourages a smoother driving style rather than constant jackrabbit starts, which inherently helps maintain efficiency. Those who frequently engage the Sport S+ mode and exploit the V6’s full potential will, of course, see their fuel economy dip accordingly. For more details, explore RC MPG across all years.

How it compares

The 2025 Lexus RC 350 AWD holds its own against competitors, particularly when considering its naturally aspirated engine and all-wheel drive. A direct rival like the Mercedes-Benz C 300 4MATIC Coupe, with its 2.0L turbo-four, achieves a slightly better 26 MPG combined (23 city/31 highway). However, that’s a different engine character; the C 300’s forced induction delivers its power differently, appealing to a different driving sensibility. The BMW 430i xDrive Coupe, also with a 2.0L turbo-four, posts an identical 26 MPG combined (23 city/32 highway). When moving to six-cylinder options, the comparison shifts. A BMW M440i xDrive Coupe, with its turbocharged inline-six, delivers 25 MPG combined (22 city/31 highway), marginally better but frequently at a higher price point and with a distinct, more aggressive driving dynamic from its turbo setup. Even an Audi A5 45 TFSI quattro, with its 2.0L turbo-four, comes in at 27 MPG combined (24 city/32 highway). The RC 350 AWD buyer isn’t chasing raw MPG figures at the expense of Lexus reliability, the naturally aspirated V6’s linear power delivery, or its distinctive Japanese luxury appeal. It’s a choice for those who value tradition and a proven powertrain over bleeding-edge turbocharged efficiency numbers. For a broader perspective on Lexus vehicles, check out all Lexus fuel economy data.

Tips to maximize efficiency

Maintain consistent highway speeds whenever possible. The 8-speed automatic is designed to optimize cruising efficiency, so letting it settle into its highest gear without constant speed fluctuations makes a significant difference.

Smooth acceleration and braking are key. The RC 350 AWD is a substantial vehicle, and minimizing abrupt inputs reduces the energy required to get it moving and bring it to a stop, directly impacting city fuel economy.

Regular maintenance, as prescribed by Lexus, is crucial. Fresh oil, properly inflated tires, and clean air filters ensure the engine and all-wheel-drive system are operating at their peak efficiency, preventing unnecessary fuel consumption.

Engage Eco mode when driving conditions allow. While the RC 350 isn’t primarily an economy car, its Eco mode will soften throttle response and optimize transmission shift points to eke out a few extra miles per gallon, particularly on longer journeys.

Plan your routes to avoid heavy traffic and excessive idling. The 3.5L V6, like any engine, consumes fuel even when stationary, and minimizing stop-and-go situations is one of the most effective ways to preserve your city MPG.