The 2017 Honda Civic Si Coupe gets 32 MPG combined. That number only tells part of the story. This isn’t some milquetoast economy car where efficiency is the sole reason for its existence. Instead, the Si represents a sweet spot: a fun-to-drive, engaging coupe that doesn’t punish you at the pump. Buyers choose the Si because they prioritize driver involvement, handling prowess, and youthful styling over outright fuel efficiency. They’re willing to accept slightly lower numbers than the base Civic in exchange for the Si’s turbocharged engine, sport-tuned suspension, and slick-shifting manual transmission.

City and highway performance

The EPA estimates the 2017 Honda Civic Si Coupe achieves 28 MPG in the city and 38 MPG on the highway. This split reflects the nature of the car. The city number is adequate, not particularly impressive, but acceptable for a sporty vehicle frequently subjected to stop-and-go traffic. The highway figure, however, is where the Si shines. That 38 MPG comes from the efficiency of the 1.5-liter turbocharged engine when cruising at a steady speed. It underscores the car’s ability to serve as a capable daily driver, even on longer commutes. The manual transmission, while central to the Si’s character, means drivers are actively engaged in selecting the optimal gear for efficiency on the highway.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2017 Honda Civic Si Coupe at precisely $1,800. This is based on driving 15,000 miles per year and using national average fuel prices. The $1,800 figure provides a useful benchmark for comparing the Si’s running costs against other vehicles. Keep in mind that individual driving habits and fluctuations in fuel prices will influence the cost you actually pay. Choosing premium fuel will immediately increase this figure, and aggressive driving will see it soar. The EPA provides all Honda fuel economy data if you want to compare to other cars from the automaker.

Real-world expectations

While the EPA estimates provide a standardized benchmark, real-world MPG can vary significantly. Si owners tend to drive their cars more enthusiastically than typical Civic drivers. The temptation to explore the engine’s powerband, and to enjoy the engaging manual transmission, often leads to a slight dip in observed fuel economy. Expect to see numbers slightly below, or right around, the EPA estimates in mixed driving. Hardcore enthusiasts, particularly those who frequently visit the track or prioritize performance above all else, are likely to record lower figures. However, disciplined drivers focused on maximizing fuel economy can certainly match or even exceed the EPA’s projections.

How it compares

Compared to its competitors, the 2017 Honda Civic Si Coupe finds itself in a competitive position. The Subaru BRZ, while offering a similarly engaging driving experience, delivers a marginally lower 24 MPG combined with its manual transmission. The VW GTI in two-door guise is in the same ballpark, around 28 MPG combined depending on the year and trim. The Mazda3, often lauded for its driving dynamics, can achieve similar or slightly better fuel economy, especially in its milder engine trims, but it doesn’t offer the same sporty edge as the Si. Those considering a Hyundai Elantra Sport (around 29 MPG combined) will find that the Si offers sharper handling and a more refined engine. These comparisons matter to the Si buyer because they demonstrate that the Honda strikes a balance: it offers genuine performance without sacrificing too much fuel efficiency. For further comparisons, check the CIVIC MPG across all years to look for vehicles with similar gas mileage.

Tips to maximize efficiency

The most direct way to improve fuel economy in the Civic Si is to adopt smooth, consistent driving habits. Avoid rapid acceleration and hard braking, which dramatically increase fuel consumption. Gentle starts and anticipating traffic flow will yield measurable improvements.

Pay attention to tire pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder. Regularly check and maintain the recommended tire pressure listed on the doorjamb sticker, and consider increasing it slightly for highway driving.

Use cruise control whenever possible on the highway. Maintaining a constant speed minimizes fluctuations in fuel consumption, allowing the engine to operate more efficiently. The Si’s 6-speed manual allows the driver to choose a gear that perfectly matches the speed, further enhancing efficiency.

Avoid unnecessary weight. Carrying extra cargo in the trunk or rear seats increases the vehicle’s load, reducing fuel economy. Remove any items that aren’t essential for daily driving.

While the Si is designed for spirited driving, resist the temptation to constantly rev the engine to redline. Shifting at lower RPMs, where the engine is more efficient, will significantly improve fuel economy. Remember that the turbocharger works best when you need it, not all the time.