19 MPG combined. Fuel economy is likely pretty low on the list of priorities for anyone considering a 2017 Subaru WRX with the 2.5-liter engine. This isn’t a commuter car; it’s a rally-bred performance machine cloaked in a relatively unassuming sedan body. The target demographic—enthusiasts, tuners, weekend racers—understand that extracting exhilarating performance from a turbocharged engine demands a sacrifice, and that sacrifice comes in the form of more frequent trips to the gas station. They’re paying for the experience, not necessarily the efficiency.

City and highway performance

The EPA estimates for the 2017 WRX with the 2.5L engine and manual transmission paint a clearer picture. Expect 17 MPG in the city and 23 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the turbocharger is constantly spooling up and down, burning extra fuel with each acceleration. The highway MPG, while better, is still modest, likely due to the WRX’s relatively short gearing designed for maximizing acceleration rather than cruising efficiency. Remember that the eager driver doesn’t typically engage the overdrive gear at legal speeds!

Annual fuel cost

The EPA estimates the annual fuel cost for the 2017 Subaru WRX 2.5L at $3,050. This figure is based on driving 15,000 miles per year and using national average fuel prices. Naturally, your actual fuel costs will vary depending on how many miles you drive annually and the prevailing gasoline prices in your area. Consider this a benchmark for comparison, but factor in your own specific driving habits and local fuel costs for a more accurate estimate. The WRX MPG across all years varies, so comparing model years is worthwhile.

Real-world expectations

Real-world fuel economy for the 2017 WRX 2.5L often falls slightly below the EPA estimates, especially for drivers with a heavy foot. Expect figures in the range of 15-18 MPG in mixed driving if you enjoy exploiting the engine’s power. If you focus on smooth acceleration and judicious use of the turbo, you might achieve the EPA combined estimate, but consistent highway driving is key to hitting or exceeding the 23 MPG highway rating. Those who modify their WRX, particularly by increasing turbo boost or installing a less restrictive exhaust, can expect a further decrease in fuel economy. These performance mods do not usually boost the car’s efficiency.

How it compares

The 2017 WRX’s fuel economy lags behind some of its competitors. A 2017 Volkswagen GTI, for instance, manages 24 MPG combined with its 2.0-liter turbo engine. Even the all-wheel-drive Ford Focus RS, another performance-oriented hot hatch, can achieve 22 MPG combined. The Subaru’s lower numbers highlight the relative inefficiency of its older 2.5-liter engine, especially when compared to more modern, direct-injected powertrains found in some of its rivals. A Hyundai Elantra Sport from the era, while not in the same performance category, boasts a combined EPA rating of 29 MPG, illustrating the compromise WRX buyers willingly make. Check all Subaru fuel economy data for more comparisons.

Tips to maximize efficiency

Drive smoothly and avoid excessive acceleration. The WRX’s turbocharger is enjoyable, but each burst of power comes at a cost. Gentle throttle inputs and anticipating traffic flow will significantly improve your fuel economy. Short shifting, or upshifting at lower RPMs, can also help by keeping the engine out of the boost range.

Keep your tires properly inflated. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly, especially during temperature changes, and inflate them to the recommended pressure listed on the doorjamb sticker or in your owner’s manual. Remember that high performance summer tires (often fitted on WRXs) are much more sensitive to minor changes in tire pressure.

Minimize idling. Modern engines are surprisingly efficient at restarting, so avoid letting your WRX idle unnecessarily. Turn off the engine if you’re stopped for more than a minute or two. Extended idling wastes fuel and contributes to unnecessary emissions.

Use the correct grade of gasoline. The 2017 WRX 2.5L requires premium fuel (91 octane or higher) to prevent knocking and maintain optimal performance. Using lower-octane fuel can damage the engine and decrease fuel economy. Don’t skimp on fuel quality to save a few dollars; it’s not worth the risk.

Reduce weight and improve aerodynamics. Removing unnecessary items from your car, such as golf clubs or heavy tools, can slightly improve fuel economy. Ensure your roof rack, if you have one, is removed when not in use, as it can increase drag and reduce MPG. Similarly, a clean air filter and properly maintained engine components can help optimize performance and efficiency.