The 2020 Acura RLX with the 3.5L V6 engine gets 23 MPG combined. While not the most fuel-efficient car in its class, that figure should be viewed in context. The RLX prioritizes a smooth ride, a well-appointed interior, and Acura’s reputation for reliability, over maximum fuel efficiency. It’s a relaxed highway cruiser, not a bare-bones economy car.

City and highway performance

The EPA estimates rate the RLX 3.5L V6 at 20 MPG in the city and 29 MPG on the highway. The city number reflects the inefficiencies of stop-and-go traffic, where the engine idles or accelerates frequently. The highway number is where the RLX performs well. Its 10-speed automatic transmission helps keep the engine at optimal RPMs at cruising speeds, contributing to a respectable, though not class-leading, figure for long journeys. These numbers are based on standardized testing, so actual mileage will vary depending on driving habits and conditions.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,500 for the 2020 Acura RLX 3.5L V6. This is based on driving 15,000 miles per year and using the national average fuel price for regular gasoline at the time of testing. Your actual fuel cost depends on how much you drive and local gas prices. This estimate provides a benchmark for comparing the RLX to other vehicles and highlights the importance of considering running costs in addition to the initial purchase price.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy often differs. Aggressive driving, frequent short trips, and heavy loads can all reduce mileage. You can get closer to the EPA estimates by maintaining a steady speed on the highway, anticipating traffic, and avoiding sudden acceleration. Some RLX owners report highway MPG figures in the low 30s during relaxed cruising, exceeding the official EPA rating. Smooth, consistent driving and proper vehicle maintenance are key.

How it compares

In the mid-size luxury sedan segment, the 2020 Acura RLX’s fuel economy is in the middle of the pack. The Lexus ES 350 achieves an EPA-estimated 26 MPG combined, making it slightly more efficient. The BMW 530i, with its turbocharged four-cylinder engine, gets 28 MPG combined, showing the efficiency of smaller engines. Models like the Infiniti Q50 with the V6 achieve around 22 MPG combined, closer to the RLX. Potential RLX buyers may cross-shop these cars, and the Acura is a competent, but not groundbreaking, option in terms of fuel efficiency. See RLX MPG across all years for model comparisons.

Tips to maximize efficiency

The 10-speed automatic transmission in the RLX is designed to optimize fuel economy. Drive smoothly and let the transmission shift. Avoid aggressive acceleration, which forces downshifts and burns more gas. Gradual acceleration allows the vehicle to stay in higher gears, increasing efficiency.

Tire pressure affects fuel economy. Inflate your tires to the recommended pressure, which is on the driver’s side doorjamb. Underinflated tires increase rolling resistance, making the engine work harder and consuming more fuel. Regularly check and maintain tire pressure to improve efficiency. The Acura brand has all Acura fuel economy data available.

Reduce the weight in your vehicle. Heavy items in the trunk or back seat increase the vehicle’s weight, which reduces fuel economy. Remove unnecessary items, such as sports equipment or tools. The lighter the vehicle, the less energy it takes to move it.

Use cruise control on the highway when possible. Maintaining a consistent speed reduces variations in fuel consumption. Cruise control helps avoid unnecessary acceleration and deceleration, which can improve highway MPG, especially on long, flat roads.

Regular maintenance is important for good fuel economy. Keep your engine properly tuned, and change the oil and filters as recommended. A well-maintained engine operates more efficiently, resulting in better gas mileage. Addressing minor issues quickly can prevent them from becoming larger problems that could hurt fuel consumption.