2021 BMW 3 Series EPA Fuel Economy Summary
The 2021 BMW 3 Series delivers an EPA-certified 25–30 MPG combined (22–26 city / 31–36 highway depending on engine and drivetrain) across 6 configurations. Hybrid variants achieve up to 26 MPG combined, compared to 30 MPG for standard gasoline trims. Plug-in hybrid (PHEV) models offer up to 23 miles of all-electric range at 75 MPGe. Estimated annual fuel costs range from $2,550 to $3,050.
2021 BMW 3 Series Powertrain & Efficiency Comparison
Factual efficiency differences across gasoline, hybrid, plug-in hybrid, and electric variants
Standard Gasoline Trims
Annual Fuel Cost: $2,550–$2,700 (2 configurations)
Hybrid (HEV) Trims
Annual Fuel Cost: $2,900–$3,050 (Saves ~$-350/yr vs gas)
Plug-In Hybrid (PHEV)
Gasoline Combined: 28 MPG • Annual Energy Cost: $2,700
Official EPA Fuel Economy Ratings by Configuration (6 Variants)
Laboratory certification test values across engine, transmission, and drivetrain permutations
| Configuration / Model | Powertrain | Drivetrain | Transmission | City | Highway | Combined | EV Range | Annual Fuel Cost | CO2 (g/mi) |
|---|---|---|---|---|---|---|---|---|---|
| 330i Premium | 2L 4-Cyl Gas | Rear-Wheel Drive | Automatic (S8) | 26 MPG | 36 MPG | 30 MPG | — | $2,550 | — |
| 330i xDrive Premium | 2L 4-Cyl Gas | All-Wheel Drive | Automatic (S8) | 25 MPG | 34 MPG | 28 MPG | — | $2,700 | — |
| 330e Premium and Electricity | 2L Plug-in Hybrid | Rear-Wheel Drive | Automatic (S8) | 72 MPGe (25 MPG) | 80 MPGe (33 MPG) | 75 MPGe (28 MPG) | 23 mi | $2,700 | — |
| M340i Premium | 3L Hybrid | Rear-Wheel Drive | Automatic (S8) | 23 MPG | 32 MPG | 26 MPG | — | $2,900 | — |
| M340i xDrive Premium | 3L Hybrid | All-Wheel Drive | Automatic (S8) | 22 MPG | 31 MPG | 25 MPG | — | $3,050 | — |
| 330e xDrive Premium and Electricity | 2L Plug-in Hybrid | All-Wheel Drive | Automatic (S8) | 64 MPGe (22 MPG) | 71 MPGe (30 MPG) | 67 MPGe (25 MPG) | 20 mi | $3,050 | — |
Deterministic Fuel Cost & Consumption Benchmarks
Standardized annual energy consumption and operating cost metrics based on 15,000 annual miles
Fuel Cost per 25 Miles
Based on $3.50 per gallon regular gasoline
Annual Fuel Consumption
Estimated annual energy units needed for 15,000 miles
5-Year Fuel Cost vs Avg Vehicle
Compared to the average new vehicle over 5 years
Fuel economy ratings, electric range figures, and energy cost estimates on this page are retrieved directly from the United States Environmental Protection Agency (EPA) and U.S. Department of Energy (FuelEconomy.gov) certified vehicle database.
Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.