32 MPG combined. That’s what the 2018 Honda Civic Si coupe delivers, and for the enthusiast driver, it’s a perfectly acceptable compromise. This isn’t a Prius, it’s a sporty, engaging machine designed for driving thrills on a budget. The Si buyer prioritizes handling, feedback, and the joy of shifting gears over maximizing every last drop of fuel. They accept the penalty, if you can even call it that, because of the fun this coupe offers in return.

City and highway performance

The EPA estimates for the 2018 Civic Si coupe are 28 MPG in the city and 38 MPG on the highway. The city figure reflects stop-and-go driving, where the Si, with its turbocharged engine and relatively short gearing, is less efficient than on the open road. The highway number highlights the engine’s efficiency at cruising speeds. While the occasional downshift to pass might nudge that figure down slightly, the overall number is still impressive for a car with its level of performance. Owners find that this engine is more efficient in city driving once they upgrade the vehicle’s turbocharger.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2018 Honda Civic Si coupe is $1,800. This figure is based on driving 15,000 miles per year and using national average fuel prices. This is an estimate, and your actual fuel costs will vary depending on your driving habits, the type of fuel you use, and where you live. Drivers in areas with higher fuel costs or more aggressive driving styles will likely exceed this estimate, while those who carefully monitor their driving habits and live in areas with lower fuel prices might spend less. Even at this cost, the Si remains an accessible way to enjoy performance driving.

Real-world expectations

While the EPA estimates provide a good baseline, real-world fuel economy for the 2018 Civic Si coupe will vary. Drivers who frequently engage in spirited driving, using the engine’s full potential, will likely see figures closer to the low end of the EPA range, or even slightly below. Conversely, drivers who prioritize fuel efficiency and adopt a more relaxed driving style could potentially exceed the EPA estimates, especially on long highway journeys. Many owners average around 30 MPG in mixed driving conditions. a testament to the engine’s inherent efficiency and the driver’s ability to balance performance with economy. Those interested in other Honda models can view all Honda fuel economy data on this site.

How it compares

Compared to its competitors, the 2018 Civic Si coupe holds its own in terms of fuel economy. The Volkswagen GTI, a perennial rival, achieves an EPA estimated 28 MPG combined with its manual transmission, putting it slightly behind the Si. The Mazda3, known for its sporty handling, manages around 31 MPG combined in its hatchback configuration.

While some non-turbocharged competitors might achieve slightly better fuel economy, they often lack the Si’s punchy mid-range torque and overall driving engagement. The Si buyer is making a conscious choice, prioritizing a specific blend of performance and efficiency, and its figures are more than adequate for this kind of vehicle. One can also compare the CIVIC MPG across all years to see how the Si fits into overall fuel economy trends.

Tips to maximize efficiency

Embrace smooth acceleration. The Civic Si’s turbocharged engine rewards drivers who use gentle inputs. Avoid sudden bursts of acceleration from a standstill, as this consumes more fuel. Gradual acceleration allows the turbocharger to build boost efficiently, minimizing fuel waste.

Use cruise control on the highway whenever possible. Maintaining a consistent speed helps optimize fuel efficiency by preventing unnecessary acceleration and deceleration. Even slight variations in speed can negatively impact fuel economy, so cruise control is a valuable tool for minimizing these fluctuations. And it gives the driver a break.

Properly maintain tire pressure. Underinflated tires increase rolling resistance, which in turn reduces fuel economy. Check your tire pressure regularly and inflate your tires to the manufacturer’s recommended pressure, typically found on a sticker inside the driver’s side doorjamb. This will improve fuel economy and extend the life of your tires.

Minimize idling time. Idling consumes fuel without covering any distance. If you anticipate being stationary for more than a minute or two, turn off the engine. This is especially important in city driving, where idling can significantly contribute to fuel consumption.

Shift consciously. The Civic Si’s precise manual transmission gives drivers a chance to maximize fuel economy. Avoid revving the engine unnecessarily high before shifting, and upshift as soon as possible without bogging down the engine. This may slightly impact the car’s sporty driving feel, but it will improve fuel economy.