2018 BMW i3 Gas Tank Size & Fuel Capacity
Fuel tank capacity
2.3gal · 9 L
The 2018 BMW i3 has a fuel tank capacity of 2.3 gallons (9 liters) on every trim.
A full tank is good for roughly 76 highway miles or 83 miles around town, going by the EPA ratings.
2.3 gal · Smaller than 100% of 2018 models we list.
2018 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 36 / 33Range 83 / 76 mi | 0.6L 2cyl DD Plug-in hybrid | RWD | 2.3 gal9 L | 36 / 33 | 83 / 76 mi | |
| s 4dr Hatchback w/Range Extender 0.6L 2cyl DD · RWD Plug-in hybrid MPG 36 / 33Range 83 / 76 mi | 0.6L 2cyl DD Plug-in hybrid | RWD | 2.3 gal9 L | 36 / 33 | 83 / 76 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 2018 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 35 MPG, a full 2.3-gallon tank covers about 81 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 2.3 | 76 | 83 |
| 3/4 | 1.7 | 57 | 62 |
| 1/2 | 1.2 | 38 | 41 |
| 1/4 | 0.6 | 19 | 21 |
| 1/8 | 0.3 | 9 | 10 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 429 gallons, roughly 186 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
- 35 MPG
- Tailpipe CO2
- 29 g/mi
- EPA greenhouse score
- 10 of 10
- Source
- EPA ratings
What it costs to fill up a 2018 BMW i3
$12.14 to fill the 2.3-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 |
|---|---|---|---|---|
| 2.3 gal | Premium | $5.28 | $12.14 | $9.11 |
By region, 2.3-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $11.34 |
| Midwest | $5.37 | $12.35 |
| Gulf CoastLowest | $4.57 | $10.51 |
| Rocky Mountain | $5.12 | $11.78 |
| West Coast | $6.08 | $13.98 |
| CaliforniaHighest | $6.36 | $14.63 |
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
- 2.3-gallon tank$12.14
- A year of driving (15,000 mi)$2,263
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 2018 i3 uses the same 2.3 gal tank as the 2017 model.
| 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 |
| 2015 i3 | 2.4 gal | 89 mi |
| 2014 i3 | 2.4 gal | 89 mi |
2018 BMW i3 fuel system recalls
None of the 3 recalls NHTSA lists for the 2018 BMW i3 involve the fuel system.
Frequently asked questions
What is the fuel tank capacity of the 2018 BMW i3?
The 2018 BMW i3 holds 2.3 gallons (9 liters) on every trim we list.
How many gallons and liters does the 2018 BMW i3 gas tank hold?
The 2018 BMW i3 tank holds 9 liters, or 2.3 gallons in US gallons.
How far can a 2018 BMW i3 go on a full tank?
About 76 miles on the highway and 83 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 2018 BMW i3 go on a quarter tank?
About 19 highway miles or 21 in town from the 2.3-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 2018 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 2018 BMW i3?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 2.3-gallon tank from empty costs $12.14. It ranges from $10.51 in the Gulf Coast to $14.63 in California.
How much does a full tank of gas weigh in a 2018 BMW i3?
About 14 pounds for the 2.3-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Has the 2018 BMW i3 had a fuel pump or fuel system recall?
No. None of the 3 recalls NHTSA lists for the 2018 BMW i3 involve the fuel system.
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).
- Recalls: NHTSA recall database (BMW fuel system recalls).
Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.