BMW · Compact cars · Hybrid
BMW 3 Series Hybrid: MPG and annual fuel cost, 2026
At 31 MPG combined, the BMW 3 Series Hybrid sits 3 MPG below the compact cars median of 34, which makes it 13th of 21 compact cars, in the lower half.
- 31MPG combined13th of 21 in class
- $2,650a year in fuel14th of 21 in class
- 286g/mile CO2
Where it stands
Compared only with the hybrid models of its class it is 3rd of 5 hybrid compact cars, in the upper half, ahead of 50% of the others. The median of that narrower group is 31 MPG, against 34 MPG for all compact cars together.
Across every class it is tied for 34th of 88 hybrid models, in the upper half.
BMW has 23 models in the 2026 data. This one ranks 5th of them on combined rating, against a make median of 28 MPG.
In its class, just ahead of it is the Mini Cooper at 32 MPG and just behind it is the Mercedes-Benz CLA-Class Hybrid at 30 MPG.
Fuel cost and CO2
At 15,000 miles a year with 55% of them in the city, with premium gasoline at $5.48 per gallon, the annual fuel bill of the most efficient version is about $2,650. That is $700 more than the compact cars median of $1,950, which makes it 14th of 21 compact cars, in the lower half.
It emits 286 g of CO2 per mile from the tailpipe; the compact cars median is 265, a difference of 21 g/mile.
Rated versions
In the city the most efficient version is rated 28 and on the highway 35, 7 better on the open road. 4 versions are rated for 2026. The most efficient, 330i Sedan: 2.0 L, 4 cyl hybrid, Automatic (S8), RWD, gets 31 MPG; the least efficient listed, M340i xDrive Sedan: 3.0 L, 6 cyl hybrid, Automatic (S8), AWD, gets 29 MPG, a gap of 2 MPG. With the file's assumptions that gap is worth about $200 a year in fuel.
| Version | Combined MPG | City MPG | Highway MPG | Annual fuel cost | CO2 g/mile |
|---|---|---|---|---|---|
| 330i Sedan: 2.0 L, 4 cyl hybrid, Automatic (S8), RWD | 31 | 28 | 35 | $2,650 | 286 |
| 330i xDrive Sedan: 2.0 L, 4 cyl hybrid, Automatic (S8), AWD | 29 | 26 | 34 | $2,850 | 298 |
| M340i Sedan: 3.0 L, 6 cyl hybrid, Automatic (S8), RWD | 29 | 27 | 33 | $2,850 | 299 |
| M340i xDrive Sedan: 3.0 L, 6 cyl hybrid, Automatic (S8), AWD | 29 | 26 | 33 | $2,850 | 304 |
Year by year
The BMW 3 Series Hybrid is in the data for 5 of the 8 model years from 2019 to 2026. Its best combined rating went from 26 in 2022 to 31 MPG in 2026, up 5 MPG. The number of rated versions grew from 2 to 4. Fuel cost for the best version is $2,650 in the latest data against $3,150 in 2022, although the file applies today's fuel prices to every model year, so that change comes from the rating, not from prices.
| Model year | Versions | Best MPG | Lowest MPG | Fuel cost | CO2 g/mi | Class median |
|---|---|---|---|---|---|---|
| 2026 | 4 | 31 | 29 | $2,650 | 286 | 34 |
| 2025 | 4 | 31 | 29 | $2,650 | 286 | 30.5 |
| 2024 | 2 | 26 | 26 | $3,150 | 340 | 30 |
| 2023 | 2 | 26 | 26 | $3,150 | 340 | 29 |
| 2022 | 2 | 26 | 26 | $3,150 | 333 | 30 |
Similar models
| Model | Powertrain | Combined MPG | Annual fuel cost | Model year |
|---|---|---|---|---|
| Mini Cooper | Gasoline | 32 | $2,550 | 2026 |
| Mercedes-Benz C-Class Hybrid | Hybrid | 29 | $2,850 | 2026 |
| Volkswagen GLI | Gasoline | 29 | $2,300 | 2026 |
| Volkswagen Jetta | Gasoline | 34 | $1,950 | 2026 |
| Toyota Corolla | Gasoline | 35 | $1,900 | 2026 |
Compare and rank
Rankings: Compact cars, Hybrid, BMW.
Data: US EPA and DOE, as prepared in methods and data.