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 Buick LeSabre 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 21 MPG, a full 18.0-gallon tank covers about 378 miles.
Gauge
Gallons
Highway miles
City miles
Full
18.0
486
306
3/4
13.5
365
230
1/2
9.0
243
153
1/4
4.5
122
77
1/8
2.3
61
38
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 714 gallons, roughly 40 full tanks.
In real driving: owners who log fill-ups at fueleconomy.gov average 23 MPG in the LeSabre (7 drivers), about 414 miles on a full 18.0-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.
At 18.0 gallons, the LeSabre's largest tank ranks second of the five 1998 sedans compared here. The Toyota Avalon carries the most (18.5 gal) and the Chrysler Concorde the least (17.0 gal).
Other 1998 sedans of a similar size, one model per brand.
1998 Buick LeSabre fuel system recalls
NHTSA lists 1 fuel-system recall for the 1998 Buick LeSabre, out of 1 recall in total. A recall applies only to the vehicles named in it, so check your VIN.
On certain passenger vehicles equipped with 3800 v6 (l36) engines and certain delphi fuel pressure regulators, the regulators have a much higher than usual rate of fuel leaks. A leak can allow fuel to enter the intake manifold through a vacuum line. If the engine does not start when cranked, the fuel from the leaking regulator and a mistimed spark can cause a backfire.
Risk and remedy
Risk: The backfire can rupture the intake manifold. The rupture of the intake manifold can displace a fuel line, pulling an injector out of place, and causing a fuel leak and possible fire.
Remedy: Dealers will install new fuel pressure regulators with improved diaphragms. The recall will be conducted in phased mailings. Phase 1 began on june 30, 2004, and phase 2 began on september 30, 2004. Owners should contact buick at 1-866-608-8080, oldsmobile at 1-800-630-6537, or pontiac at 1-800-620-7668.
What is the fuel tank capacity of the 1998 Buick LeSabre?
The 1998 Buick LeSabre holds 18.0 gallons (68 liters) on every trim we list.
How many gallons and liters does the 1998 Buick LeSabre gas tank hold?
The 1998 Buick LeSabre tank holds 68 liters, or 18.0 gallons in US gallons.
How far can a 1998 Buick LeSabre go on a full tank?
About 486 miles on the highway and 306 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 Buick LeSabre go on a quarter tank?
About 122 highway miles or 77 in town from the 18.0-gallon tank, which has roughly 4.5 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
How many miles does a 1998 Buick LeSabre really get on a tank?
Drivers who log their fill-ups at fueleconomy.gov average 23 MPG in the 1998 Buick LeSabre (7 drivers), which works out to about 414 miles on a full 18.0-gallon tank.
What gas does the 1998 Buick LeSabre take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 1998 Buick LeSabre?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 18.0-gallon tank from empty costs $76.86. It ranges from $66.60 in the Gulf Coast to $106.02 in California.
How much does a full tank of gas weigh in a 1998 Buick LeSabre?
About 112 pounds for the 18.0-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 1998 Buick LeSabre have a bigger gas tank than the Oldsmobile Eighty-Eight?
No, they match: both top out at 18.0 gallons in 1998.
Has the 1998 Buick LeSabre had a fuel pump or fuel system recall?
Yes. NHTSA lists 1 fuel-system recall for the 1998 Buick LeSabre: 04V090000 (delivery). Check your VIN at nhtsa.gov/recalls to see if your car is affected.
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).