29 MPG combined is a respectable figure for the 2018 Subaru Legacy AWD 2.5L, but considering its mission and target demographic, it’s more about dependable all-weather performance than outright fuel sipping. This isn’t a hybrid designed for maximum efficiency, it’s a practical, mid-size sedan engineered for reliability and sure-footedness, especially in regions prone to snow and challenging road conditions. The fuel economy is simply a reasonable compromise within that package.

City and highway performance

The EPA estimates place the 2018 Legacy at 25 MPG in the city and 34 MPG on the highway. The city figure reflects the stop-and-go reality of urban driving, where the Legacy’s naturally aspirated 2.5L engine and automatic transmission work harder to accelerate and decelerate. The highway MPG is more favorable, showcasing the benefit of consistent speeds and less demand on the engine. These numbers represent a benchmark, but remember that individual driving habits, traffic, and weather conditions will inevitably influence fuel consumption in real-world scenarios. The Legacy uses a continuously variable transmission (CVT) which Subaru calls “AV-S7”. Though it mimics a seven-speed automatic, it’s still a CVT, which some drivers find can cause the engine to drone under hard acceleration.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Subaru Legacy AWD 2.5L at $1,500. This figure is based on driving 15,000 miles per year and using national average fuel prices. Keep in mind that fuel prices fluctuate, and your actual mileage may vary depending on your driving habits. However, $1,500 provides a solid baseline for budgeting your transportation expenses. For Legacy owners concerned with cost, keeping track of fuel consumption can help them anticipate and manage the costs, giving them the information they need to choose the most efficient route to any given destination. It also can show when maintenance on the car is needed in order to keep it at its advertised fuel economy numbers.

Real-world expectations

While the EPA figures provide a standardized benchmark, real-world fuel economy often differs due to variations in driving style, terrain, and environmental factors. Legacy owners who prioritize smooth acceleration, maintain consistent speeds, and avoid excessive idling are more likely to achieve numbers closer to the EPA estimates. Conversely, aggressive drivers who frequently engage in rapid acceleration and braking will likely experience lower fuel economy.

Another important factor is geography. The Legacy’s AWD system adds weight and complexity, which can negatively impact fuel economy, especially in hilly or mountainous regions. Owners should monitor their fuel consumption over time to establish a baseline and identify any potential issues that may be affecting efficiency. You can also see LEGACY MPG across all years.

How it compares

In the competitive mid-size sedan segment, the 2018 Legacy’s fuel economy stacks up differently depending on the drivetrain configurations. For example, the Toyota Camry LE with its 2.5L 4-cylinder engine achieves an EPA-estimated 32 MPG combined, noticeably better than the Legacy’s 29 MPG. However, the Camry doesn’t offer standard all-wheel drive. The Nissan Altima with its 2.5L engine achieves around 31 MPG combined, again surpassing the Legacy though also lacking standard AWD. The Ford Fusion, before its discontinuation, offered an all-wheel-drive option, but its fuel economy was typically in line with or slightly below the Legacy’s figures. The Subaru Impreza, a smaller sedan from the same manufacturer, has a slightly higher EPA of 31, but is smaller and targeted toward a different audience. The Legacy’s core selling point isn’t segment-leading fuel economy, it’s the combination of AWD, practicality, and reliability that appeals to buyers in regions where all-weather capability is essential.

Tips to maximize efficiency

The Legacy’s AWD system distributes power to all four wheels, enhancing traction but also adding weight and complexity that can impact fuel economy. Ensuring proper tire inflation is critical. Maintaining the recommended tire pressure minimizes rolling resistance, which in turn reduces the amount of energy required to propel the vehicle. Check your tire pressure regularly, especially during temperature changes, as pressure can fluctuate.

The continuously variable transmission (CVT) in the 2018 Legacy is designed to optimize fuel efficiency by keeping the engine in its most efficient operating range. Drive smoothly and avoid sudden acceleration, allowing the CVT to adjust the gear ratios. Quick bursts of speed force the engine to work harder and consume more fuel. Anticipate traffic flow and maintain a steady pace whenever possible.

Excessive idling consumes fuel without covering any distance. If you anticipate being stopped for more than a minute, consider turning off the engine. This is especially relevant in urban environments where traffic congestion is common. Restarting the engine consumes a small amount of fuel, but it’s generally less than the amount wasted during prolonged idling.

The Legacy’s AWD system is a valuable asset in inclement weather, but it’s not always necessary in dry conditions. Consider switching to front-wheel drive mode if your Legacy is so equipped, or simply drive with a lighter foot in clear conditions especially on the highway. By reducing demand on the AWD system, you can potentially improve fuel economy. Remember to re-engage AWD when conditions warrant it for optimal traction and safety.

Regular maintenance is essential for optimal fuel efficiency. Keep the engine properly tuned, and replace air filters and spark plugs according to the manufacturer’s recommendations. A clean air filter ensures proper airflow to the engine, while functioning spark plugs ensure efficient combustion. Neglecting these maintenance items can negatively impact fuel economy and performance. See all Subaru fuel economy data for a wider view.