2021 head-to-head · Subcompact Car
2021 BMW i3 Plug-in Hybrid vs Mercedes-Benz A-Class
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
RWD · 0.6L 2-cyl · Single-speed · 100 MPGe + 31 MPG
The 2021 BMW i3 Plug-in Hybrid is the cheaper one to run. Driving 15,000 miles a year with 18¢/kWh electricity and $3.95/gal premium gas, it costs about $948 a year to fuel (100 MPGe + 31 MPG), versus $2,043 for the 2021 Mercedes-Benz A-Class (29 MPG). That's roughly $1,095 a year, or about $5,477 over five years.
Your numbers
Change these to match your driving and local prices. Every figure and chart on this page updates.
Fuel cost over 10 years
- BMW i3 Plug-in Hybrid
- Mercedes-Benz A-Class
Side by side
| BMW i3 Plug-in Hybrid | Mercedes-Benz A-Class | |
|---|---|---|
| $948 | Your annual fuel cost | $2,043 |
| 100 MPGe + 31 MPG | Combined efficiency | 29 MPG |
| 107 MPGe / 30 MPG | City | 25 MPG |
| 93 MPGe / 31 MPG | Highway | 36 MPG |
| 32 kWh | Electricity use (kWh/100 mi) | — |
| 200 mi | Driving range | — |
| 126 mi | All-electric range | — |
| 84 cu ft | Passenger volume | 91 cu ft |
| 15 cu ft | Cargo volume | 9 cu ft |
| 22 g/mi | Tailpipe CO₂ (g/mi) | 309 g/mi |
| 10/10 | EPA fuel economy score | 6/10 |
| 10/10 | EPA greenhouse gas score | 6/10 |
| 7 hrs | Charge time at 240V | — |
| Plug-in hybrid | Powertrain | Gas |
| Premium gas + electricity | Fuel | Premium gasoline |
| 0.6L 2-cyl | Engine / motor | 2.0L 4-cyl turbo |
| Single-speed | Transmission | 7-speed dual-clutch |
| RWD | Drivetrain | FWD |
✓ marks the better value. EPA scores run 1–10 (10 is best). Volumes come from the EPA interior volume index and aren't published for every body style.
BMW i3 Plug-in Hybrid vs Mercedes-Benz A-Class across model years
- BMW i3 Plug-in Hybrid
- Mercedes-Benz A-Class
Annual fuel cost of the most efficient configuration of each model year, at your prices. Click a point to open that year.
How they differ
Per EPA interior volume figures, the Mercedes-Benz A-Class has more passenger space (91 vs. 84 cu ft); the BMW i3 Plug-in Hybrid has more cargo space (15 vs. 9 cu ft).
Among 34 2021 subcompact cars, the BMW i3 Plug-in Hybrid ranks 3rd and the Mercedes-Benz A-Class 12th for lowest fuel cost.
The powertrains differ: the BMW i3 Plug-in Hybrid is a plug-in hybrid, while the Mercedes-Benz A-Class is a conventional gas model.
Frequently asked questions
Which is more fuel-efficient, the 2021 BMW i3 Plug-in Hybrid or the 2021 Mercedes-Benz A-Class?
Measured by cost to drive, the BMW i3 Plug-in Hybrid. The BMW i3 Plug-in Hybrid is rated 100 MPGe + 31 MPG combined and the Mercedes-Benz A-Class 29 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2021 BMW i3 Plug-in Hybrid vs. the Mercedes-Benz A-Class per year?
At 15,000 miles a year with 18¢/kWh electricity and $3.95/gal premium gas, about $948 for the BMW i3 Plug-in Hybrid and $2,043 for the Mercedes-Benz A-Class.
Which has more cargo space?
The BMW i3 Plug-in Hybrid, with 15 cu ft of luggage volume versus 9 cu ft (EPA interior volume index).
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