1998 Cadillac Seville Gas Tank Size & Fuel Capacity
Fuel tank capacity
18.5gal · 70 L
The 1998 Cadillac Seville has a fuel tank capacity of 18.5 gallons (70 liters) on every trim.
A full tank is good for roughly 444 highway miles or 278 miles around town, going by the EPA ratings.
18.5 gal · Smaller than 52% of 1998 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
1998 Cadillac Seville fuel tank capacity by trim
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| SLS 4dr Sedan 4.6L 8cyl 4A · FWD MPG 15 / 24Range 278 / 444 mi | 4.6L 8cyl 4A | FWD | 18.5 gal70 L | 15 / 24 | 278 / 444 mi | |
| STS 4dr Sedan 4.6L 8cyl 4A · FWD MPG 15 / 24Range 278 / 444 mi | 4.6L 8cyl 4A | FWD | 18.5 gal70 L | 15 / 24 | 278 / 444 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 Cadillac Seville 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 18.5-gallon tank covers about 333 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 18.5 | 444 | 278 |
| 3/4 | 13.9 | 333 | 208 |
| 1/2 | 9.3 | 222 | 139 |
| 1/4 | 4.6 | 111 | 69 |
| 1/8 | 2.3 | 56 | 35 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 833 gallons, roughly 45 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
- 18 MPG
- Tailpipe CO2
- 494 g/mi
- Source
- EPA ratings
What it costs to fill up a 1998 Cadillac Seville
$78.99 to fill the 18.5-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 |
|---|---|---|---|---|
| 18.5 gal | Regular | $4.27 | $78.99 | $59.25 |
By region, 18.5-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $74.37 |
| Midwest | $4.27 | $78.99 |
| Gulf CoastLowest | $3.70 | $68.45 |
| Rocky Mountain | $4.46 | $82.51 |
| West Coast | $5.42 | $100.27 |
| CaliforniaHighest | $5.89 | $108.96 |
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
- 18.5-gallon tank$78.99
- 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.
Seville tank size in other years
The tank changed for 1998: 18.5 gal, down from 20.0 gal on the 1997 Seville.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2003 Seville | 18.5 gal | 463 mi |
| 2002 Seville | 18.5 gal | 463 mi |
| 2001 Seville | 18.5 gal | 463 mi |
| 2000 Seville | 18.5 gal | 463 mi |
| 1999 Seville | 18.5 gal | 444 mi |
| 1998 Seville | 18.5 gal | 444 mi |
| 1997 Seville | 20.0 gal | 480 mi |
| 1996 Seville | 20.0 gal | 480 mi |
| 1995 Seville | 20.0 gal | 460 mi |
| 1994 Seville | 20.0 gal | 460 mi |
| 1993 Seville | 20.0 gal | 460 mi |
1998 Cadillac Seville vs similar 1998 sedans
At 18.5 gallons, the Seville's largest tank ranks fifth 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 |
| Jaguar XJ-Series | 21.4 gal | 471 mi |
| INFINITI Q45 | 21.4 gal | 471 mi |
| Cadillac Seville | 18.5 gal | 444 mi |
| Acura RL | 18.0 gal | 414 mi |
Other 1998 sedans of a similar size, one model per brand.
1998 Cadillac Seville fuel system recalls
None of the 2 recalls NHTSA lists for the 1998 Cadillac Seville involve the fuel system.
1998 Cadillac Seville fuel pump and gauge parts
NHTSA lists no fuel-system recall for the 1998 Cadillac Seville, 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 1998 Cadillac Seville?
The 1998 Cadillac Seville holds 18.5 gallons (70 liters) on every trim we list.
How many gallons and liters does the 1998 Cadillac Seville gas tank hold?
The 1998 Cadillac Seville tank holds 70 liters, or 18.5 gallons in US gallons.
How far can a 1998 Cadillac Seville go on a full tank?
About 444 miles on the highway and 278 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 Cadillac Seville go on a quarter tank?
About 111 highway miles or 69 in town from the 18.5-gallon tank, which has roughly 4.6 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 1998 Cadillac Seville take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 1998 Cadillac Seville?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 18.5-gallon tank from empty costs $78.99. It ranges from $68.45 in the Gulf Coast to $108.96 in California.
How much does a full tank of gas weigh in a 1998 Cadillac Seville?
About 115 pounds for the 18.5-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 1998 Cadillac Seville have a bigger gas tank than the Jaguar XJ-Series?
No. The 1998 Jaguar XJ-Series holds up to 21.4 gallons; the 1998 Cadillac Seville holds up to 18.5.
Has the 1998 Cadillac Seville had a fuel pump or fuel system recall?
No. None of the 2 recalls NHTSA lists for the 1998 Cadillac Seville 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 (Cadillac 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.