2018 BMW X4 Gas Tank Size & Fuel Capacity
Fuel tank capacity
17.7gal · 67 L
The 2018 BMW X4 has a fuel tank capacity of 17.7 gallons (67 liters) on every trim.
A full tank is good for roughly 443–496 highway miles or 319–354 miles around town, going by the EPA ratings.
17.7 gal · Smaller than 51% of 2018 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
- Other years
- Compared
- Fuel recalls
- Pump & gauge parts
- FAQ
2018 BMW X4 fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Engine
- no difference
All 2 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| M40i 4dr SUV AWD 3.0L 6cyl Turbo 8A · AWD MPG 18 / 25Range 319 / 443 mi | 3.0L 6cyl Turbo 8A | AWD | 17.7 gal67 L | 18 / 25 | 319 / 443 mi | |
| xDrive28i 4dr SUV AWD 2.0L 4cyl Turbo 8A · AWD MPG 20 / 28Range 354 / 496 mi | 2.0L 4cyl Turbo 8A | AWD | 17.7 gal67 L | 20 / 28 | 354 / 496 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 X4 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 23 MPG, a full 17.7-gallon tank covers about 407 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 17.7 | 496 | 354 |
| 3/4 | 13.3 | 372 | 266 |
| 1/2 | 8.9 | 248 | 177 |
| 1/4 | 4.4 | 124 | 89 |
| 1/8 | 2.2 | 62 | 44 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 652 gallons, roughly 37 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
- 21–23 MPG
- Tailpipe CO2
- 384–429 g/mi
- EPA greenhouse score
- 4–5 of 10
- Source
- EPA ratings
What it costs to fill up a 2018 BMW X4
$93.46 to fill the 17.7-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 |
|---|---|---|---|---|
| 17.7 gal | Premium | $5.28 | $93.46 | $70.09 |
By region, 17.7-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $87.26 |
| Midwest | $5.37 | $95.05 |
| Gulf CoastLowest | $4.57 | $80.89 |
| Rocky Mountain | $5.12 | $90.62 |
| West Coast | $6.08 | $107.62 |
| CaliforniaHighest | $6.36 | $112.57 |
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
- 17.7-gallon tank$93.46
- A year of driving (15,000 mi)$3,443
Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.
X4 tank size in other years
The 2018 X4 uses the same 17.7 gal tank as every X4 since 2015.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2023 X4 | 17.2 gal | 482 mi |
| 2022 X4 | 17.2 gal | 482 mi |
| 2021 X4 | 17.2 gal | 499 mi |
| 2020 X4 | 17.2 gal | 482 mi |
| 2019 X4 | 17.2 gal | 499 mi |
| 2018 X4 | 17.7 gal | 496 mi |
| 2017 X4 | 17.7 gal | 478 mi |
| 2016 X4 | 17.7 gal | 496 mi |
| 2015 X4 | 17.7 gal | 496 mi |
2018 BMW X4 vs similar 2018 SUVs
At 17.7 gallons, the X4's largest tank ranks fourth of the seven 2018 SUVs compared here. The Cadillac XT5 carries the most (21.7 gal) and the Lexus NX 300h the least (14.8 gal).
| 2018 model | Tank | Longest highway range |
|---|---|---|
| Cadillac XT5 | 19.4–21.7 gal | 543 mi |
| Porsche Macan | 19.8 gal | 495 mi |
| Audi Q5 | 18.5 gal | 500 mi |
| BMW X4 | 17.7 gal | 496 mi |
| Mercedes-Benz GLC-Class | 13.2–17.4 gal | 487 mi |
| Alfa Romeo Stelvio | 16.9 gal | 473 mi |
| Lexus NX 300h | 14.8 gal | 444 mi |
Other 2018 SUVs of a similar size, one model per brand.
2018 BMW X4 fuel system recalls
None of the 1 recall NHTSA lists for the 2018 BMW X4 involve the fuel system.
2018 BMW X4 fuel pump and gauge parts
NHTSA lists no fuel-system recall for the 2018 BMW X4, so a failed pump or gauge is a normal repair. These are the part numbers the makers list for it.
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Frequently asked questions
What is the fuel tank capacity of the 2018 BMW X4?
The 2018 BMW X4 holds 17.7 gallons (67 liters) on every trim we list.
How many gallons and liters does the 2018 BMW X4 gas tank hold?
The 2018 BMW X4 tank holds 67 liters, or 17.7 gallons in US gallons.
How far can a 2018 BMW X4 go on a full tank?
About 443–496 miles on the highway and 319–354 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 X4 go on a quarter tank?
About 124 highway miles or 89 in town from the 17.7-gallon tank, which has roughly 4.4 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2018 BMW X4 take?
Premium unleaded (required). The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2018 BMW X4?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 17.7-gallon tank from empty costs $93.46. It ranges from $80.89 in the Gulf Coast to $112.57 in California.
How much does a full tank of gas weigh in a 2018 BMW X4?
About 110 pounds for the 17.7-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2018 BMW X4 have a bigger gas tank than the Porsche Macan?
No. The 2018 Porsche Macan holds up to 19.8 gallons; the 2018 BMW X4 holds up to 17.7.
Has the 2018 BMW X4 had a fuel pump or fuel system recall?
No. None of the 1 recall NHTSA lists for the 2018 BMW X4 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.