- Counting every gasoline-fueled configuration (including hybrids), midsize cars average 29.2 MPG combined versus 28.2 MPG for compact cars, so a midsize car costs about $45 less per year to fuel at 12,000 miles and $3.10 per gallon.
- Counting conventional (non-hybrid) gasoline cars only, the classes are nearly identical: compact 26.2 MPG and midsize 26.0 MPG, a difference of about $11 a year in favor of compact.
- The class-average gap comes from hybrids: 61 midsize hybrid configurations average 35.8 MPG against 32.5 MPG for 48 compact hybrid configurations.
- Within each class the range is far wider than the gap between classes: conventional compacts run from 17 to 39 MPG and conventional midsize cars from 15 to 36 MPG.
01 Overview
Does a smaller car cost less to fuel? The EPA assigns each passenger car to a size class from its interior volume, and the Fuel Economy Guide lists every certified configuration. This article compares the compact class (152 gasoline-fueled configurations in model years 2024 and 2025) with the midsize class (204). The answer depends on whether hybrids are counted: with them, midsize cars average slightly better fuel economy than compact cars; without them, the classes are almost equal.
EPA/DOE Fuel Economy Guide (vehicles.csv), model years 2024 to 2025, EPA classes Compact Cars and Midsize Cars; gasoline-fueled configurations, of which 48 compact and 61 midsize are hybrids and 5 compact and 12 midsize are plug-in hybrids (rated in gasoline mode)02 Fuel Economy Comparison
| Metric | Compact | Midsize | Compact − Midsize |
|---|---|---|---|
| Average combined MPG, all gasoline-fueled | 28.2 | 29.2 | -1.0 |
| Average city MPG, all gasoline-fueled | 25.6 | 26.6 | -1.0 |
| Average highway MPG, all gasoline-fueled | 32.7 | 33.5 | -0.8 |
| Average combined MPG, conventional only | 26.2 | 26.0 | +0.2 |
| Average combined MPG, hybrids only | 32.5 | 35.8 | -3.3 |
| Best conventional gasoline MPG | 39 | 36 | +3 |
| Worst conventional gasoline MPG | 17 | 15 | +2 |
Including hybrids, midsize cars post the higher average combined, city and highway MPG. Among conventional gasoline cars only, compact is 0.2 MPG ahead, and the best and worst conventional compacts (39 and 17 MPG) both beat the best and worst conventional midsize cars (36 and 15 MPG).
Estimate your vehicle's driving cost using official EPA fuel economy data.
Use the Calculator03 Annual Fuel Cost
At 12,000 miles per year and $3.10 per gallon, the annual fuel cost difference between the classes is small at the class-average level, and the spread between the best and worst model within a class is larger than the gap between classes.
| Scenario | MPG (compact vs midsize) | Compact cost | Midsize cost | Difference |
|---|---|---|---|---|
| Class average, all gasoline-fueled | 28.2 vs 29.2 MPG | $1,319 | $1,274 | Midsize −$45 |
| Conventional (non-hybrid) gasoline only | 26.2 vs 26.0 MPG | $1,420 | $1,431 | Compact −$11 |
| Hybrids only | 32.5 vs 35.8 MPG | $1,145 | $1,039 | Midsize −$106 |
| Best conventional gasoline model | 39 vs 36 MPG | $954 | $1,033 | Compact −$79 |
| Worst conventional gasoline model | 17 vs 15 MPG | $2,188 | $2,480 | Compact −$292 |
| High mileage (15,000 mi/yr), class average | 28.2 vs 29.2 MPG | $1,649 | $1,592 | Midsize −$56 |
Between the best and worst conventional model in the same class, annual fuel cost differs by $1,234 for compact cars and $1,447 for midsize cars, far more than the $45 class-average gap. Which specific model you choose matters more than whether you choose compact or midsize.
Calculated from the table above04 Why the Averages Differ
The class averages differ because of hybrids, not because of conventional cars. The share of gasoline-fueled configurations that are hybrids is similar (31.6% of compact and 29.9% of midsize), but midsize hybrids average 35.8 MPG against 32.5 MPG for compact hybrids, a 3.3 MPG gap, while conventional cars differ by only 0.2 MPG. This site does not have a documented weight comparison for these classes, so it does not say whether vehicle weight plays a role.
EPA/DOE Fuel Economy Guide, model years 2024 to 2025: hybrid share = hybrid configurations ÷ all gasoline-fueled configurations in the class; average combined MPG by powertrain05 Five-Year Cost Difference
| Scenario | 5-year compact | 5-year midsize | 5-year difference |
|---|---|---|---|
| Class average, all gasoline-fueled | $6,596 | $6,370 | Midsize −$226 |
| Conventional (non-hybrid) gasoline only | $7,099 | $7,154 | Compact −$55 |
| Hybrids only | $5,723 | $5,196 | Midsize −$528 |
| Best conventional gasoline model | $4,769 | $5,167 | Compact −$397 |
| Worst conventional gasoline model | $10,941 | $12,400 | Compact −$1,459 |
| High mileage (15,000 mi/yr), class average | $8,245 | $7,962 | Midsize −$282 |
06 Data Sources
- EPA/DOE: Fuel Economy Guide database, model years 2024 and 2025. fueleconomy.gov
- EIA: U.S. regular gasoline retail price, 2025 average. eia.gov