2021 BMW i3 Gas Tank Size & Fuel Capacity
Fuel tank capacity
2.4gal · 9 L
The 2021 BMW i3 has a fuel tank capacity of 2.4 gallons (9 liters) on every trim.
A full tank is good for roughly 74 highway miles or 72 miles around town, going by the EPA ratings.
2.4 gal · Smaller than 100% of 2021 models we list.
2021 BMW i3 fuel tank capacity by trim
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| 4dr Hatchback w/Range Extender 0.6L 2cyl DD · RWD Plug-in hybrid MPG 30 / 31Range 72 / 74 mi | 0.6L 2cyl DD Plug-in hybrid | RWD | 2.4 gal9 L | 30 / 31 | 72 / 74 mi | |
| s 4dr Hatchback w/Range Extender 0.6L 2cyl DD · RWD Plug-in hybrid MPG 30 / 31Range 72 / 74 mi | 0.6L 2cyl DD Plug-in hybrid | RWD | 2.4 gal9 L | 30 / 31 | 72 / 74 mi | |
| No trim matches all of these filters. | ||||||
Tank figures are the manufacturer's rated capacity, sorted smallest tank first. Range is tank size times EPA city or highway MPG.
How far a 2021 BMW i3 goes on a tank
Gallons left and the distance they cover at each mark on the fuel gauge, at EPA city and highway mileage. At the combined rating of 31 MPG, a full 2.4-gallon tank covers about 74 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 2.4 | 74 | 72 |
| 3/4 | 1.8 | 56 | 54 |
| 1/2 | 1.2 | 37 | 36 |
| 1/4 | 0.6 | 19 | 18 |
| 1/8 | 0.3 | 9 | 9 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 484 gallons, roughly 202 full tanks.
Fuel gauges aren't perfectly linear and the low-fuel light comes on with a few gallons still in the tank, so plan your stop before the last eighth.
- EPA combined
- 31 MPG
- Tailpipe CO2
- 22 g/mi
- EPA greenhouse score
- 10 of 10
- Source
- EPA ratings
What it costs to fill up a 2021 BMW i3
$12.67 to fill the 2.4-gallon tank from empty with premium, at this week's US average of $5.28 a gallon.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 2.4 gal | Premium | $5.28 | $12.67 | $9.50 |
By region, 2.4-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $11.83 |
| Midwest | $5.37 | $12.89 |
| Gulf CoastLowest | $4.57 | $10.97 |
| Rocky Mountain | $5.12 | $12.29 |
| West Coast | $6.08 | $14.59 |
| CaliforniaHighest | $6.36 | $15.26 |
Prices: U.S. Energy Information Administration retail averages for the week of October 26, 2026. This week's prices by state and city.
Your own price
- 2.4-gallon tank$12.67
- A year of driving (15,000 mi)$2,555
Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.
i3 tank size in other years
The tank changed for 2021: 2.4 gal, up from 2.3 gal on the 2020 i3.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2021 i3 | 2.4 gal | 74 mi |
| 2020 i3 | 2.3 gal | 71 mi |
| 2019 i3 | 2.3 gal | 71 mi |
| 2018 i3 | 2.3 gal | 76 mi |
| 2017 i3 | 2.3 gal | 76 mi |
| 2016 i3 | 1.9 gal | 70 mi |
Frequently asked questions
What is the fuel tank capacity of the 2021 BMW i3?
The 2021 BMW i3 holds 2.4 gallons (9 liters) on every trim we list.
How many gallons and liters does the 2021 BMW i3 gas tank hold?
The 2021 BMW i3 tank holds 9 liters, or 2.4 gallons in US gallons.
How far can a 2021 BMW i3 go on a full tank?
About 74 miles on the highway and 72 miles in town, going from full to empty at its EPA ratings. Expect less in practice, since nobody runs the tank dry.
How many miles can a 2021 BMW i3 go on a quarter tank?
About 19 highway miles or 18 in town from the 2.4-gallon tank, which has roughly 0.6 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2021 BMW i3 take?
Premium unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2021 BMW i3?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 2.4-gallon tank from empty costs $12.67. It ranges from $10.97 in the Gulf Coast to $15.26 in California.
How much does a full tank of gas weigh in a 2021 BMW i3?
About 15 pounds for the 2.4-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Sources
- Tank sizes: manufacturer-rated capacities from US-market specifications, checked against independent references. Updated October 2026.
- MPG and range: EPA ratings (fueleconomy.gov). Range is tank size times EPA MPG.
- Fuel prices: U.S. Energy Information Administration, week of October 26, 2026 (this week's prices).
Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.