2021 · Compact Car · Gas
2021 BMW 3 Series MPG & fuel economy
The 2021 BMW 3 Series is a compact car offered in 2 EPA-rated configurations. The most efficient version returns 30 MPG combined (26 city / 36 highway) on premium gasoline. Across the lineup, combined ratings range from 28 to 30 MPG. Efficiency is unchanged from the 2020 model. Among 37 compact cars rated for 2021, it ranks 20th for lowest fuel cost. At 15,000 miles a year with $3.95/gal premium gas, it costs about $1,975 a year to fuel.
What will it cost you?
Your mileage and prices are saved and used across the site.
Fuel average
The 2021 BMW 3 Series's fuel average is 12.8 km/L (7.8 L/100 km), or 30 MPG combined: 11.1 km/L in the city and 15.3 km/L on the highway.
| MPG | km/L | L/100 km | |
|---|---|---|---|
| City | 26 | 11.1 | 9.0 |
| Highway | 36 | 15.3 | 6.5 |
| Combined | 30 | 12.8 | 7.8 |
How it ranks among 2021 Compact Cars
Full class ranking →Annual fuel cost at 15,000 miles and default prices; shorter bars cost less.
3 Series MPG across model years
Full history →2 EPA-rated configurations
| Configuration | Type | City | Hwy | Combined | Range | Your cost / yr |
|---|---|---|---|---|---|---|
| RWD · 2.0L 4-cyl turbo · 8-speed automatic 330i |
Gas | 26 MPG | 36 MPG | 30 MPG | — | $1,975 |
| AWD · 2.0L 4-cyl turbo · 8-speed automatic 330i xDrive |
Gas | 25 MPG | 34 MPG | 28 MPG | — | $2,116 |
Specs (most efficient configuration)
- Fuel
- Premium gasoline
- Engine / motor
- 2.0L 4-cyl turbo
- Transmission
- 8-speed automatic
- Drivetrain
- RWD
- Passenger volume
- 94 cu ft
- Cargo volume
- 13 cu ft
- Tailpipe CO₂
- 298 g/mi
- EPA fuel economy score
- 6/10
- EPA greenhouse gas score
- 6/10
2021 BMW 3 Series vs. rivals
Compare the 2021 3 Series
With any other car from any year, including other 3 Series model years. Type a year to jump, e.g. "2015 Accord".
Same year, other powertrains: 2021 BMW 3 Series Plug-in Hybrid (75 MPGe + 28 MPG)
Frequently asked questions
What is the gas mileage of the 2021 BMW 3 Series?
Up to 30 MPG combined (26 city / 36 highway); ratings range from 28 to 30 MPG depending on configuration.
What fuel does the 2021 BMW 3 Series use?
Premium gasoline (premium is required or recommended by the manufacturer).
What is the fuel average in km/L for the 2021 BMW 3 Series?
The 2021 BMW 3 Series's fuel average is 12.8 km/L (7.8 L/100 km), or 30 MPG combined: 11.1 km/L in the city and 15.3 km/L on the highway.
How much does it cost to fuel the 2021 BMW 3 Series per year?
About $1,975 at 15,000 miles a year with $3.95/gal premium gas, or $13.17 per 100 miles. Use the calculator on this page to plug in your own mileage and prices.