2018 · Compact Car · Diesel
2018 BMW 3 Series Diesel MPG & fuel economy
The 2018 BMW 3 Series Diesel is a compact car offered in 2 EPA-rated configurations. The most efficient version returns 36 MPG combined (31 city / 43 highway) on diesel. Across the lineup, combined ratings range from 34 to 36 MPG. Efficiency is unchanged from the 2017 model. Among 44 compact cars rated for 2018, it ranks 20th for lowest fuel cost. At 15,000 miles a year with $3.70/gal diesel fuel, it costs about $1,542 a year to fuel.
What will it cost you?
Your mileage and prices are saved and used across the site.
Fuel average
The 2018 BMW 3 Series Diesel's fuel average is 15.3 km/L (6.5 L/100 km), or 36 MPG combined: 13.2 km/L in the city and 18.3 km/L on the highway.
| MPG | km/L | L/100 km | |
|---|---|---|---|
| City | 31 | 13.2 | 7.6 |
| Highway | 43 | 18.3 | 5.5 |
| Combined | 36 | 15.3 | 6.5 |
How it ranks among 2018 Compact Cars
Full class ranking →Annual fuel cost at 15,000 miles and default prices; shorter bars cost less.
3 Series Diesel 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 328d |
Diesel | 31 MPG | 43 MPG | 36 MPG | — | $1,542 |
| AWD · 2.0L 4-cyl turbo · 8-speed automatic 328d xDrive |
Diesel | 30 MPG | 40 MPG | 34 MPG | — | $1,632 |
Specs (most efficient configuration)
- Fuel
- Diesel
- Engine / motor
- 2.0L 4-cyl turbo
- Transmission
- 8-speed automatic
- Drivetrain
- RWD
- Passenger volume
- 96 cu ft
- Cargo volume
- 13 cu ft
- Tailpipe CO₂
- 285 g/mi
- EPA fuel economy score
- 8/10
- EPA greenhouse gas score
- 7/10
2018 BMW 3 Series Diesel vs. rivals
Compare the 2018 3 Series Diesel
With any other car from any year, including other 3 Series Diesel model years. Type a year to jump, e.g. "2015 Accord".
Same year, other powertrains: 2018 BMW 3 Series (28 MPG), 2018 BMW 3 Series Plug-in Hybrid (71 MPGe + 30 MPG)
Frequently asked questions
What is the gas mileage of the 2018 BMW 3 Series Diesel?
Up to 36 MPG combined (31 city / 43 highway); ratings range from 34 to 36 MPG depending on configuration.
What fuel does the 2018 BMW 3 Series Diesel use?
Diesel.
What is the fuel average in km/L for the 2018 BMW 3 Series Diesel?
The 2018 BMW 3 Series Diesel's fuel average is 15.3 km/L (6.5 L/100 km), or 36 MPG combined: 13.2 km/L in the city and 18.3 km/L on the highway.
How much does it cost to fuel the 2018 BMW 3 Series Diesel per year?
About $1,542 at 15,000 miles a year with $3.70/gal diesel fuel, or $10.28 per 100 miles. Use the calculator on this page to plug in your own mileage and prices.