MPG & Fuel Economy Data
The 2018 Honda Civic Si 4Dr has an estimated 32.0 MPG combined. This premium gasoline-powered vehicle offers 28.0 MPG in the city and 38.0 MPG on the highway. Check out its full EPA-estimated fuel economy data below.
Combined32.0 MPG
City28.0 MPG
Highway38.0 MPG
CO₂ Emissions279 g/mi
GHG Score7/10
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With a Greenhouse Gas Score of 7/10, the 2018 Honda Civic Si 4Dr demonstrates excellent environmental performance in its class. This high score indicates a significant reduction in greenhouse gas emissions compared to other vehicles.
The vehicle produces approximately 279 grams of CO₂ per mile under typical driving conditions. This represents average carbon emissions for its vehicle type.
This midsize cars features a 1.5L 4-cylinder engine, paired with a manual 6-spd transmission and front-wheel drive drivetrain. Plus it has a turbocharged engine for improved power and efficiency.
To achieve the best fuel economy in your 2018 Honda Civic Si 4Dr, consider these tips:
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This Fuel Savings Calculator tool is provided for informational and educational purposes only. The MPG data used is sourced from the U.S. Environmental Protection Agency (EPA), an official government resource, and while efforts are made to ensure accuracy, discrepancies or updates may occur. Calculations are based on standard assumptions and estimates, which may not reflect individual circumstances or real-world conditions. Users are responsible for verifying results with their own data and should consult additional resources or/and professionals for critical decisions. This tool is provided "as is" without warranties of any kind, and the developers disclaim any liability for decisions or actions taken based on its output. The tool may be updated or modified without notice, affecting its functionality or results. By using this tool, you acknowledge and agree to these terms.
32.0 MPG
View detailed fuel economy data
32.0 MPG
View detailed fuel economy data
32.0 MPG
View detailed fuel economy data
These vehicles are in the same class (Midsize Cars) and offer comparable fuel economy ratings.