2018 BMW 4 Series Gas Tank Size & Fuel Capacity
Fuel tank capacity
15.8gal · 60 L
The 2018 BMW 4 Series has a fuel tank capacity of 15.8 gallons (60 liters) on every trim.
A full tank is good for roughly 458–537 highway miles or 316–379 miles around town, going by the EPA ratings.
15.8 gal · Smaller than 71% of 2018 models we list.
Listed separately: 2018 BMW 4 Series Gran Coupe (15.8 gal).
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
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- FAQ
2018 BMW 4 Series fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Drive
- no difference
- Engine
- no difference
All 8 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| 430i 2dr Convertible 2.0L 4cyl Turbo 8A · RWD MPG 24 / 34Range 379 / 537 mi | 2.0L 4cyl Turbo 8A | RWD | 15.8 gal60 L | 24 / 34 | 379 / 537 mi | |
| 430i 2dr Coupe 2.0L 4cyl Turbo 8A · RWD MPG 24 / 34Range 379 / 537 mi | 2.0L 4cyl Turbo 8A | RWD | 15.8 gal60 L | 24 / 34 | 379 / 537 mi | |
| 430i xDrive 2dr Convertible AWD 2.0L 4cyl Turbo 8A · AWD MPG 22 / 32Range 348 / 506 mi | 2.0L 4cyl Turbo 8A | AWD | 15.8 gal60 L | 22 / 32 | 348 / 506 mi | |
| 430i xDrive 2dr Coupe AWD 2.0L 4cyl Turbo 8A · AWD MPG 23 / 33Range 363 / 521 mi | 2.0L 4cyl Turbo 8A | AWD | 15.8 gal60 L | 23 / 33 | 363 / 521 mi | |
| 440i 2dr Convertible 3.0L 6cyl Turbo 8A · RWD MPG 21 / 29Range 332 / 458 mi | 3.0L 6cyl Turbo 8A | RWD | 15.8 gal60 L | 21 / 29 | 332 / 458 mi | |
| 440i 2dr Coupe 3.0L 6cyl Turbo 8A · RWD MPG 21 / 32Range 332 / 506 mi | 3.0L 6cyl Turbo 8A | RWD | 15.8 gal60 L | 21 / 32 | 332 / 506 mi | |
| 440i xDrive 2dr Convertible AWD 3.0L 6cyl Turbo 8A · AWD MPG 20 / 29Range 316 / 458 mi | 3.0L 6cyl Turbo 8A | AWD | 15.8 gal60 L | 20 / 29 | 316 / 458 mi | |
| 440i xDrive 2dr Coupe AWD 3.0L 6cyl Turbo 8A · AWD MPG 21 / 31Range 332 / 490 mi | 3.0L 6cyl Turbo 8A | AWD | 15.8 gal60 L | 21 / 31 | 332 / 490 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 4 Series 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 27 MPG, a full 15.8-gallon tank covers about 427 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 15.8 | 537 | 379 |
| 3/4 | 11.9 | 403 | 284 |
| 1/2 | 7.9 | 269 | 190 |
| 1/4 | 4.0 | 134 | 95 |
| 1/8 | 2.0 | 67 | 47 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 556 gallons, roughly 35 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
- 23–27 MPG
- Tailpipe CO2
- 324–382 g/mi
- EPA greenhouse score
- 5–6 of 10
- Source
- EPA ratings
What it costs to fill up a 2018 BMW 4 Series
$83.42 to fill the 15.8-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 |
|---|---|---|---|---|
| 15.8 gal | Premium | $5.28 | $83.42 | $62.57 |
By region, 15.8-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $77.89 |
| Midwest | $5.37 | $84.85 |
| Gulf CoastLowest | $4.57 | $72.21 |
| Rocky Mountain | $5.12 | $80.90 |
| West Coast | $6.08 | $96.06 |
| CaliforniaHighest | $6.36 | $100.49 |
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
- 15.8-gallon tank$83.42
- A year of driving (15,000 mi)$2,933
Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.
4 Series tank size in other years
The 2018 4 Series uses the same 15.8 gal tank as every 4 Series since 2014.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2023 4 Series | 15.6 gal | 530 mi |
| 2022 4 Series | 15.6 gal | 530 mi |
| 2021 4 Series | 15.6 gal | 530 mi |
| 2020 4 Series | 15.8 gal | 537 mi |
| 2019 4 Series | 15.8 gal | 537 mi |
| 2018 4 Series | 15.8 gal | 537 mi |
| 2017 4 Series | 15.8 gal | 537 mi |
| 2016 4 Series | 15.8 gal | 553 mi |
| 2015 4 Series | 15.8 gal | 553 mi |
| 2014 4 Series | 15.8 gal | 553 mi |
2018 BMW 4 Series vs similar 2018 coupes
At 15.8 gallons, the 4 Series's largest tank ranks third of the four 2018 coupes compared here. The Mercedes-Benz SL-Class carries the most (19.8 gal) and the Audi S5 the least (15.3 gal).
| 2018 model | Tank | Longest highway range |
|---|---|---|
| Mercedes-Benz SL-Class | 19.8 gal | 554 mi |
| Jaguar F-TYPE | 18.5 gal | 555 mi |
| BMW 4 Series | 15.8 gal | 537 mi |
| Audi S5 | 15.3 gal | 459 mi |
Other 2018 coupes of a similar size, one model per brand.
2018 BMW 4 Series fuel system recalls
None of the 1 recall NHTSA lists for the 2018 BMW 4 Series involve the fuel system.
Frequently asked questions
What is the fuel tank capacity of the 2018 BMW 4 Series?
The 2018 BMW 4 Series holds 15.8 gallons (60 liters) on every trim we list.
How many gallons and liters does the 2018 BMW 4 Series gas tank hold?
The 2018 BMW 4 Series tank holds 60 liters, or 15.8 gallons in US gallons.
Does AWD change the 2018 BMW 4 Series gas tank?
No. RWD and AWD versions of the 2018 BMW 4 Series use the same 15.8 gal tank.
How far can a 2018 BMW 4 Series go on a full tank?
About 458–537 miles on the highway and 316–379 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 4 Series go on a quarter tank?
About 134 highway miles or 95 in town from the 15.8-gallon tank, which has roughly 4.0 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2018 BMW 4 Series take?
Premium unleaded (recommended). The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2018 BMW 4 Series?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 15.8-gallon tank from empty costs $83.42. It ranges from $72.21 in the Gulf Coast to $100.49 in California.
How much does a full tank of gas weigh in a 2018 BMW 4 Series?
About 98 pounds for the 15.8-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2018 BMW 4 Series have a bigger gas tank than the Mercedes-Benz SL-Class?
No. The 2018 Mercedes-Benz SL-Class holds up to 19.8 gallons; the 2018 BMW 4 Series holds up to 15.8.
Has the 2018 BMW 4 Series had a fuel pump or fuel system recall?
No. None of the 1 recall NHTSA lists for the 2018 BMW 4 Series 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.