The 2015 Acura RLX 3.5L gets 23 MPG combined, which may seem unremarkable, but it aligns with the car’s goal: a comfortable, technology-filled, and reliable luxury experience that’s attainable. This isn’t a sports sedan; it’s an engineered car for those who prioritize a smooth ride and features over performance. Buyers accept this fuel economy because they value Acura’s build quality and affordable ownership compared to European cars.

City and highway performance

The 2015 RLX delivers respectable fuel efficiency. EPA estimates are 20 MPG in the city, about average for a naturally aspirated V6 car. This means reasonable fuel consumption during commutes, even in traffic. The RLX does better on the highway, achieving 30 MPG. This makes it a comfortable and efficient car for long trips or frequent highway travel.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Acura RLX 3.5L at $2,500. This is based on 15,000 miles per year with average fuel prices. This is just an estimate. Your fuel costs will vary based on driving habits, fuel type (Acura recommends premium fuel), and local fuel prices. $2,500 per year offers buyers a point of comparison against other full-size luxury sedans.

Real-world expectations

EPA estimates are a benchmark, but real-world fuel economy can differ. RLX owners often report numbers close to the EPA estimates, especially on the highway where the car’s design and six-speed automatic transmission optimize fuel consumption. City MPG can change based on driving style and traffic. Those who accelerate quickly or drive in stop-and-go traffic might see numbers closer to the high teens. The RLX delivers predictable fuel economy for drivers who drive smoothly.

How it compares

The 2015 Acura RLX is in a competitive segment. The Lexus ES 350 gets slightly better fuel economy, achieving 21 MPG city and 31 MPG highway due to its lighter weight and focus on efficiency. The Audi A6 2.0T, with its turbocharged four-cylinder engine, achieves 25 MPG combined, a fuel efficiency advantage, but it may not be as smooth as a V6. The BMW 528i, also with a turbocharged four-cylinder, delivers similar numbers to the Audi. The RLX isn’t the most fuel-efficient, but it balances performance, luxury, and reliability. Buyers should reference all Acura fuel economy data for comparison.

Tips to maximize efficiency

Acura’s IDS (Integrated Dynamics System) offers “Econ” mode, which adjusts throttle response and transmission mapping to prioritize fuel efficiency. Use this mode during cruising and city driving to reduce fuel consumption. Drivers will notice a slight decrease in performance, but many find the efficiency worth it.

Keep tires properly inflated. Underinflated tires increase rolling resistance, making the engine work harder and using more fuel. The sticker on the driver’s side doorjamb has the recommended tire pressure. Check your tires often. A quick tire scan can prevent drops in efficiency.

Avoid quick acceleration and braking. Smooth driving saves fuel. Anticipate traffic and maintain speed. The RLX’s delivery is designed for this relaxed driving style.

Reduce weight. Excessive cargo in the trunk can hurt fuel economy. Remove items that aren’t needed to improve efficiency. 100 pounds removed gives the same benefit as 1% better MPG, so every little bit helps. Learn more about the Acura RLX MPG across all years for even more tips.