20 MPG combined isn’t amazing for a mid-size SUV, but that’s what you get with a 2015 Lexus RX 350 AWD with the 3.5L V6. Owners of this RX generation value a smooth ride, high reliability, and a luxurious cabin over maximizing fuel efficiency. The all-wheel-drive system offers extra security, but causes slightly lower MPG than the front-wheel-drive version.

City and highway performance

The 2015 RX 350 AWD gets an EPA-estimated 18 MPG in the city and 24 MPG on the highway. This difference shows a characteristic of many gasoline engines: better performance on the open road where they cruise at a consistent speed. The RX’s six-speed automatic transmission is smooth and predictable, but has fewer gears than newer eight- or ten-speed transmissions, which can save fuel. City driving, with constant stop-and-go, isn’t good for the 3.5L V6’s efficiency, while highway miles let the engine run in its most efficient range.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Lexus RX 350 AWD at $2,200. This is based on driving 15,000 miles per year using national average fuel prices. Your actual fuel costs will vary based on your driving and local gas prices, but the $2,200 estimate gives a standard to compare the RX’s fuel costs to other vehicles. It’s a useful number when budgeting for vehicle ownership.

Real-world expectations

EPA estimates are a baseline, but real-world fuel economy varies significantly with driving style, traffic, and even tire pressure. Owners who accelerate gradually and avoid aggressive driving are more likely to see MPG close to the EPA estimates. Those who drive fast or spend lots of time in traffic should expect lower MPG. The AWD system always uses a little efficiency, so if you don’t need it, consider a FWD model. For more information, explore RX MPG across all years.

How it compares

In 2015, the Acura MDX SH-AWD was rated at 18 MPG city and 27 MPG highway, slightly better on the highway. The Infiniti QX60 AWD got 19 MPG city and 26 MPG highway, better numbers overall. The Volvo XC60 T6 Drive-E AWD, with its smaller, turbocharged engine, achieved 20 MPG city and 29 MPG highway, showing how forced induction can save fuel. Each of these competes for families wanting luxury, space, and utility, making fuel economy a relevant comparison. Buyers should examine all Lexus fuel economy data to see where the RX fits in the Lexus lineup.

Tips to maximize efficiency

Avoid fast acceleration and hard braking. The RX 350’s 3.5L V6 responds to gentle inputs. Acceleration that is smooth minimizes fuel use, and watching traffic lets you avoid unnecessary braking.

Keep your tires inflated correctly. Underinflated tires increase rolling resistance, making the engine work harder and use more fuel. Check your tire pressure often and inflate to the pressure on the driver’s side doorjamb.

Don’t idle. Idling uses fuel without going anywhere. If you’ll be stopped for more than a minute or two, turn off the engine. The RX 350 doesn’t have automatic start/stop, but turning off the engine yourself helps.

On the highway, use cruise control. Cruise control helps keep a consistent speed, which can improve fuel economy on long trips. Watch out for hills. Cruise control might downshift on steep hills, using more fuel.

Reduce aerodynamic drag. Remove unnecessary items from the roof rack or cargo carrier, as these can significantly increase drag and reduce fuel economy, especially at higher speeds.