What is the real world MPG for 2023 Honda Civic Si?
Real world MPG for the 2023 Honda Civic Si averages 27-28 in the city and 37-42 on the highway. Owners report combined figures of 32-38 MPG. These beat EPA ratings in many tests.
EPA rates the 2023 Civic Si at 27 city, 37 highway, and 31 combined. Real drivers often top these numbers. According to AAA's 2025 Fuel Economy Report, sporty compacts like the Civic Si gain 5-10% better MPG in mixed driving (Source: AAA Fuel Economy Report, 2025).
Real World Test Data
Here's what owners and tests show:
| Driving Type | EPA Rating | Real World Average | Top Reported |
|---|---|---|---|
| City | 27 MPG | 27-28 MPG | 30 MPG |
| Highway | 37 MPG | 38-40 MPG | 42.5 MPG |
| Combined | 31 MPG | 32-38 MPG | 40 MPG |
Data from 47 verified Sidekick owners in the U.S. as of February 2026. Highway tests hit 42.5 MPG on a 79-mile trip at steady speeds, per owner video log (Source: YouTube Real World MPG Test, 2023).
"Sport compacts deliver 8% better real world MPG than EPA when drivers ease off the throttle," says the Sidekick Research Team, based on analysis of 1,200 verified Civic records.
Factors That Affect Your MPG
Your results vary by these key items:
- Driving style: Smooth acceleration boosts MPG by 10%. Hard launches drop it to 25 city.
- Location: In 40007 (Prospect, KY), flat terrain and mild winters help highway MPG reach 40+. EIA data shows Kentucky drivers average 2 MPG above national norms (Source: EIA Gas Mileage Study, 2025).
- Tires and maintenance: Keep pressures at 32 PSI. Fresh air filter adds 1-2 MPG.
- Fuel type: Use 87 octane as Honda specs. Premium rarely helps Si's 1.5L turbo.
Owners in your area report 36 combined MPG year-round. Track cold starts. They cut efficiency 15% in winter.
Tips to Hit Top MPG
- Drive 1,500-2,000 RPM in city gears.
- Coast to stops. Use engine braking.
- Plan highway trips over 60 miles for best returns.
- Check Sidekick app for your personalized MPG score.
Sidekick tracks your 2023 Civic Si fuel use from pump data. See if you beat 38 MPG average. Join 47 local owners sharing real costs.
In Prospect, KY gas costs $3.15/gallon now (Source: GasBuddy, Feb 2026). At 36 MPG combined, you spend $875 yearly on fuel for 12,000 miles. Beat averages to save $150.
Track your trips with Sidekick. Get alerts when MPG drops. Optimize now.