1998 BMW 7 Series Gas Tank Size & Fuel Capacity
Fuel tank capacity
22.5–25.1gal · 85–95 L
The 1998 BMW 7 Series has a fuel tank capacity of 22.5 to 25.1 gallons (85–95 liters), depending on the trim. The most common size is 22.5 gallons, used on 2 trims.
A full tank is good for roughly 452–495 highway miles or 326–338 miles around town, going by the EPA ratings.
25.1 gal · Bigger than 86% of 1998 models we list.
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1998 BMW 7 Series fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Engine
All 3 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| 740i 4dr Sedan 4.4L 8cyl 5A · RWD MPG 15 / 22Range 338 / 495 mi | 4.4L 8cyl 5A | RWD | 22.5 gal85 L | 15 / 22 | 338 / 495 mi | |
| 740iL 4dr Sedan 4.4L 8cyl 5A · RWD MPG 15 / 22Range 338 / 495 mi | 4.4L 8cyl 5A | RWD | 22.5 gal85 L | 15 / 22 | 338 / 495 mi | |
| 750iL 4dr Sedan 5.4L 12cyl 5A · RWD MPG 13 / 18Range 326 / 452 mi | 5.4L 12cyl 5A | RWD | 25.1 gal95 L | 13 / 18 | 326 / 452 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 1998 BMW 7 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 18 MPG, a full 22.5-gallon tank covers about 405 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 22.5 | 495 | 338 |
| 3/4 | 16.9 | 371 | 253 |
| 1/2 | 11.3 | 248 | 169 |
| 1/4 | 5.6 | 124 | 84 |
| 1/8 | 2.8 | 62 | 42 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 833 gallons, roughly 37 full tanks.
In real driving: owners who log fill-ups at fueleconomy.gov average 19.1 MPG in the 7 Series (5 drivers), about 430 miles on a full 22.5-gallon tank.
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
- 15–18 MPG
- Tailpipe CO2
- 494–592 g/mi
- Gas guzzler tax
- Yes
- Source
- EPA ratings
What it costs to fill up a 1998 BMW 7 Series
$96.07 to fill the 22.5-gallon tank from empty with regular, at this week's US average of $4.27 a gallon.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 22.5 gal | Regular | $4.27 | $96.07 | $72.06 |
| 25.1 gal | Regular | $4.27 | $107.18 | $80.38 |
By region, 22.5-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $90.45 |
| Midwest | $4.27 | $96.07 |
| Gulf CoastLowest | $3.70 | $83.25 |
| Rocky Mountain | $4.46 | $100.35 |
| West Coast | $5.42 | $121.95 |
| CaliforniaHighest | $5.89 | $132.53 |
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
- 22.5-gallon tank$96.07
- 25.1-gallon tank$107.18
- A year of driving (15,000 mi)$3,558
Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.
7 Series tank size in other years
The 1998 7 Series uses the same 22.5–25.1 gal tank sizes as every 7 Series since 1995.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2003 7 Series | 23.3 gal | 559 mi |
| 2002 7 Series | 23.3 gal | 559 mi |
| 2001 7 Series | 22.5–25.1 gal | 495 mi |
| 2000 7 Series | 22.5–25.1 gal | 495 mi |
| 1999 7 Series | 22.5–25.1 gal | 495 mi |
| 1998 7 Series | 22.5–25.1 gal | 495 mi |
| 1997 7 Series | 22.5–25.1 gal | 495 mi |
| 1996 7 Series | 22.5–25.1 gal | 495 mi |
| 1995 7 Series | 22.5–25.1 gal | 552 mi |
| 1994 7 Series | 21.5–24.0 gal | 504 mi |
| 1993 7 Series | 21.5–24.0 gal | 480 mi |
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1998 BMW 7 Series vs similar 1998 sedans
At 25.1 gallons, the 7 Series's largest tank ranks second of the four 1998 sedans compared here. The Mercedes-Benz S-Class carries the most (26.4 gal) and the Lincoln Continental the least (20.0 gal).
| 1998 model | Tank | Longest highway range |
|---|---|---|
| Mercedes-Benz S-Class | 26.4 gal | 581 mi |
| BMW 7 Series | 22.5–25.1 gal | 495 mi |
| Jaguar XJ-Series | 21.4 gal | 471 mi |
| Lincoln Continental | 20.0 gal | 440 mi |
Other 1998 sedans of a similar size, one model per brand.
1998 BMW 7 Series fuel system recalls
None of the 1 recall NHTSA lists for the 1998 BMW 7 Series involve the fuel system.
Frequently asked questions
What is the fuel tank capacity of the 1998 BMW 7 Series?
The 1998 BMW 7 Series holds between 22.5 and 25.1 gallons, depending on the trim. 22.5 gallons is the usual size; the 25.1-gallon tank comes on the 750iL 4dr Sedan (5.4L 12cyl 5A).
How many gallons and liters does the 1998 BMW 7 Series gas tank hold?
The 1998 BMW 7 Series tank holds 85–95 liters, or 22.5–25.1 gallons in US gallons.
Which 1998 BMW 7 Series has the biggest gas tank?
The 25.1-gallon tank is on the 750iL 4dr Sedan. The smallest tank, 22.5 gallons, is on the 740i 4dr Sedan.
How far can a 1998 BMW 7 Series go on a full tank?
About 452–495 miles on the highway and 326–338 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 1998 BMW 7 Series go on a quarter tank?
About 124 highway miles or 84 in town from the 22.5-gallon tank, which has roughly 5.6 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
How many miles does a 1998 BMW 7 Series really get on a tank?
Drivers who log their fill-ups at fueleconomy.gov average 19.1 MPG in the 1998 BMW 7 Series (5 drivers), which works out to about 430 miles on a full 22.5-gallon tank.
What gas does the 1998 BMW 7 Series take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 1998 BMW 7 Series?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 22.5-gallon tank from empty costs $96.07. It ranges from $83.25 in the Gulf Coast to $132.53 in California.
How much does a full tank of gas weigh in a 1998 BMW 7 Series?
About 156 pounds for the 25.1-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 1998 BMW 7 Series have a bigger gas tank than the Jaguar XJ-Series?
Yes. The 1998 BMW 7 Series holds up to 25.1 gallons; the 1998 Jaguar XJ-Series holds up to 21.4.
Has the 1998 BMW 7 Series had a fuel pump or fuel system recall?
No. None of the 1 recall NHTSA lists for the 1998 BMW 7 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).
- Real-world MPG: driver-reported fill-ups shared at fueleconomy.gov (My MPG).
Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.