1998 Lexus LS 400 Gas Tank Size & Fuel Capacity
Fuel tank capacity
22.5gal · 85 L
The 1998 Lexus LS 400 has a fuel tank capacity of 22.5 gallons (85 liters).
A full tank is good for roughly 518 highway miles or 383 miles around town, going by the EPA ratings.
22.5 gal · Bigger than 78% of 1998 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
- Other years
- Compared
- Pump & gauge parts
- FAQ
1998 Lexus LS 400 fuel tank capacity by trim
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| 4dr Sedan 4.0L 8cyl 5A · RWD MPG 17 / 23Range 383 / 518 mi | 4.0L 8cyl 5A | RWD | 22.5 gal85 L | 17 / 23 | 383 / 518 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 Lexus LS 400 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 19 MPG, a full 22.5-gallon tank covers about 428 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 22.5 | 518 | 383 |
| 3/4 | 16.9 | 388 | 287 |
| 1/2 | 11.3 | 259 | 191 |
| 1/4 | 5.6 | 129 | 96 |
| 1/8 | 2.8 | 65 | 48 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 789 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
- 19 MPG
- Tailpipe CO2
- 468 g/mi
- Source
- EPA ratings
What it costs to fill up a 1998 Lexus LS 400
$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 |
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
- A year of driving (15,000 mi)$3,371
Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.
LS 400 tank size in other years
The 1998 LS 400 uses the same 22.5 gal tank as the 1997 model.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2000 LS 400 | 21.9 gal | 504 mi |
| 1999 LS 400 | 22.5 gal | 518 mi |
| 1998 LS 400 | 22.5 gal | 518 mi |
| 1997 LS 400 | 22.5 gal | 518 mi |
| 1996 LS 400 | 22.4 gal | 538 mi |
| 1995 LS 400 | 22.5 gal | 518 mi |
| 1994 LS 400 | 22.5 gal | 495 mi |
| 1993 LS 400 | 22.4 gal | 493 mi |
1998 Lexus LS 400 vs similar 1998 sedans
At 22.5 gallons, the LS 400's largest tank ranks second of the six 1998 sedans compared here. The Audi A8 carries the most (23.7 gal) and the Acura RL the least (18.0 gal).
| 1998 model | Tank | Longest highway range |
|---|---|---|
| Audi A8 | 23.7 gal | 569 mi |
| Lexus LS 400 | 22.5 gal | 518 mi |
| INFINITI Q45 | 21.4 gal | 471 mi |
| Mercedes-Benz E-Class | 18.5–21.1 gal | 654 mi |
| Cadillac Catera | 18.0 gal | 396 mi |
| Acura RL | 18.0 gal | 414 mi |
Other 1998 sedans of a similar size, one model per brand.
1998 Lexus LS 400 fuel pump and gauge parts
These are the part numbers the makers list for the 1998 Lexus LS 400. Check the fuel system recalls first: recall repairs are free.
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Frequently asked questions
What is the fuel tank capacity of the 1998 Lexus LS 400?
The 1998 Lexus LS 400 holds 22.5 gallons (85 liters).
How many gallons and liters does the 1998 Lexus LS 400 gas tank hold?
The 1998 Lexus LS 400 tank holds 85 liters, or 22.5 gallons in US gallons.
How far can a 1998 Lexus LS 400 go on a full tank?
About 518 miles on the highway and 383 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 Lexus LS 400 go on a quarter tank?
About 129 highway miles or 96 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.
What gas does the 1998 Lexus LS 400 take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 1998 Lexus LS 400?
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 Lexus LS 400?
About 140 pounds for the 22.5-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 1998 Lexus LS 400 have a bigger gas tank than the Audi A8?
No. The 1998 Audi A8 holds up to 23.7 gallons; the 1998 Lexus LS 400 holds up to 22.5.
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.