The 2018 Subaru Legacy 3.6R Limited with standard all-wheel drive gets 23 MPG combined. While this isn’t the highest number in the mid-size sedan class, many Legacy 3.6R owners find it acceptable. They often prioritize practicality, all-weather capability, and the unique Subaru driving experience over maximum fuel efficiency.

City and highway performance

EPA estimates for the 2018 Legacy 3.6R are 20 MPG in the city and 28 MPG on the highway. These numbers reflect the demands on the 3.6-liter six-cylinder engine and the all-wheel-drive system in different conditions. Stop-and-go traffic and lower speeds in the city result in lower gas mileage. The Legacy’s constantly engaged all-wheel-drive system adds weight and requires more energy, which impacts city MPG. On the highway, at a constant speed, the engine operates more efficiently, resulting in the better, but not outstanding, 28 MPG rating. The automatic transmission’s tall overdrive gears help achieve this.

Many drivers consider highway mileage more important.

Annual fuel cost

The EPA estimates an annual fuel cost of $1,900 for the 2018 Subaru Legacy 3.6R. This is based on driving 15,000 miles per year and using national average fuel prices. Your individual fuel costs will vary depending on your driving habits and local fuel prices. Aggressive driving, extended idling, and consistently higher speeds will increase that $1,900 figure. Owners who accelerate smoothly and avoid unnecessary idling may spend less.

Real-world expectations

While the EPA provides a standard, actual fuel economy often differs. Some 2018 Legacy 3.6R drivers report figures close to the EPA estimates, while others see slightly lower or higher MPG, depending on their driving habits. Tire pressure, vehicle maintenance, and terrain can all affect real-world fuel efficiency. The Legacy’s all-wheel drive, while good for traction, also slightly lowers observed MPG compared to front-wheel drive cars.

How it compares

The 2018 Legacy 3.6R’s fuel economy is tested in the competitive mid-size sedan segment. A 2018 Toyota Camry XSE V6 gets a significantly better EPA rating of 22 city / 32 highway, for 25 MPG combined and is front-wheel drive. The Honda Accord 2.0T offers similar performance with its turbocharged four-cylinder engine and provides better fuel economy, achieving 22 city / 32 highway MPG. These differences matter to shoppers. The Legacy appeals to buyers who value all-wheel-drive capability. Subaru presents all Subaru fuel economy data, while the Camry and Accord appeal to a broader audience seeking better fuel efficiency and lower operating costs. If you want to explore LEGACY MPG across all years you can easily find information.

Tips to maximize efficiency

Accelerate and brake gently. The Legacy’s throttle can be sensitive, so avoid quick acceleration. Anticipate traffic and coast when possible to minimize fuel use. A consistent driving style will improve your MPG.

Keep your tires inflated properly. Underinflated tires increase rolling resistance, which forces the engine to work harder and use more fuel. Check your tire pressure regularly and maintain the pressure listed on the driver’s side door jamb.

Reduce extra weight in the vehicle. Extra cargo in the trunk or on the roof rack increases the vehicle’s weight and hurts fuel economy. Remove anything you don’t need to improve fuel efficiency.

Keep idling to a minimum. Leaving the engine running while stopped uses fuel without moving the car. If you’re going to be stopped for more than a minute or two, turn off the engine. Subaru’s engine stop-start system addresses this in other models (but is not on the 3.6R).

Service the engine on time. Replacing dirty air filters, using the correct spark plugs, and keeping up with maintenance will keep the engine running smoothly. See your owner’s manual for the maintenance schedule.