18 MPG combined is the stark reality for anyone considering the 2018 Subaru WRX STI Type RA. Let’s be blunt: nobody buys an STI, especially the ultra-limited Type RA, for its fuel efficiency. They buy it for ferocious acceleration, tenacious grip, and a visceral driving experience unavailable in almost anything else this side of a Porsche 911. The fuel bill is simply the price of admission for a certain type of performance enthusiast.

City and highway performance

The EPA estimates of 16 MPG in the city and 22 MPG on the highway paint a picture of the STI’s drinking habits. Stop-and-go traffic is its nemesis, the thirsty 2.5L turbo engine gulping fuel with every surge of boost. The highway number is achievable, but requires restraint, a concept alien to many STI drivers. The Type RA, with its lighter weight and tweaked suspension, *might* squeeze out slightly better numbers in ideal conditions, but expect them to be virtually indistinguishable from the standard STI in most real-world scenarios. Given the premium nature of this car and how customers are likely to drive it, EPA figures are not likely to be matched.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,200 for the 2018 Subaru WRX STI Type RA. This figure is based on driving 15,000 miles per year and using national average fuel prices. Considering the STI’s premium fuel requirement, that number is likely to be higher for most owners, especially those who live in areas with higher gas prices or who treat the car as it was intended – a performance machine. Factor in your own driving habits and local fuel costs to get a more realistic estimate.

Real-world expectations

Forget the EPA numbers. If you’re regularly seeing figures close to 18 MPG in mixed driving, consider yourself lucky. A more realistic expectation for most owners hovers around 15 MPG, and spirited driving will easily drag that number down into the single digits. This car practically begs to be driven hard, and the fuel economy suffers accordingly. Track days, canyon runs, and even aggressive commuting can turn the STI into an expensive car, especially if you have other, more rational cars in your garage.

How it compares

Compared to its rivals, the STI’s fuel economy is predictably poor. The Honda Civic Type R, for instance, manages a respectable 25 MPG combined. Even the all-wheel-drive Volkswagen Golf R achieves 25 MPG combined, a significant advantage. The now-discontinued Ford Focus RS, another all-wheel-drive hot hatch, came in at 22 MPG combined. These differences matter to some buyers, but for the dedicated STI enthusiast, the unique character and rally-bred DNA of the Subaru outweigh its efficiency shortcomings. WRX MPG across all years show a similar story, performance doesn’t come cheap.

Tips to maximize efficiency

The most important factor influencing fuel economy in the STI is driving style. Smooth acceleration and anticipation of traffic flow are critical. Avoid aggressive upshifts and downshifts when cruising, and resist the temptation to bury the throttle at every opportunity. Easier said than done, but it makes a difference.

Proper maintenance is also key. A well-tuned engine will always be more efficient. Ensure your STI receives regular oil changes with the correct synthetic blend, keep the tires properly inflated, and replace the spark plugs according to the manufacturer’s recommendations. A poorly maintained turbo engine will be even thirstier than one in good condition.

Avoid unnecessary idling. The STI’s engine is not particularly fuel-efficient at idle. If you’re stopped for more than a minute or two, it’s generally better to turn off the engine. Also, be mindful of added weight. Removing unnecessary cargo from the car can improve fuel economy, albeit marginally.

Plan your routes wisely. Stop-and-go traffic is a fuel economy killer. If possible, choose routes that minimize congestion and allow for smoother, more consistent speeds. However, we understand the draw of a twisty B-road, and we won’t judge you for prioritizing fun over fuel efficiency.

Finally, understand that modifications can significantly impact fuel economy. Performance-enhancing modifications, such as aftermarket exhausts or engine tunes, often sacrifice efficiency for power. While they might make your STI sound and feel faster, they will almost certainly reduce its fuel economy. Consider this trade-off carefully before making any modifications.