1990 Buick LeSabre Gas Tank Size & Fuel Capacity
Fuel tank capacity
18.0gal · 68 L
The 1990 Buick LeSabre has a fuel tank capacity of 18.0 gallons (68 liters) on every trim.
A full tank is good for roughly 450 highway miles or 288 miles around town, going by the EPA ratings.
18.0 gal · Smaller than 54% of 1990 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
- Other years
- Compared
- Pump & gauge parts
- FAQ
1990 Buick LeSabre fuel tank capacity by trim
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| 2dr Coupe 3.8L 6cyl 4A · FWD MPG 16 / 25Range 288 / 450 mi | 3.8L 6cyl 4A | FWD | 18.0 gal68 L | 16 / 25 | 288 / 450 mi | |
| Custom 4dr Sedan 3.8L 6cyl 4A · FWD MPG 16 / 25Range 288 / 450 mi | 3.8L 6cyl 4A | FWD | 18.0 gal68 L | 16 / 25 | 288 / 450 mi | |
| Limited 2dr Coupe 3.8L 6cyl 4A · FWD MPG 16 / 25Range 288 / 450 mi | 3.8L 6cyl 4A | FWD | 18.0 gal68 L | 16 / 25 | 288 / 450 mi | |
| Limited 4dr Sedan 3.8L 6cyl 4A · FWD MPG 16 / 25Range 288 / 450 mi | 3.8L 6cyl 4A | FWD | 18.0 gal68 L | 16 / 25 | 288 / 450 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 1990 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 19 MPG, a full 18.0-gallon tank covers about 342 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 18.0 | 450 | 288 |
| 3/4 | 13.5 | 338 | 216 |
| 1/2 | 9.0 | 225 | 144 |
| 1/4 | 4.5 | 113 | 72 |
| 1/8 | 2.3 | 56 | 36 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 789 gallons, roughly 44 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 1990 Buick LeSabre
$76.86 to fill the 18.0-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 |
|---|---|---|---|---|
| 18.0 gal | Regular | $4.27 | $76.86 | $57.64 |
By region, 18.0-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $72.36 |
| Midwest | $4.27 | $76.86 |
| Gulf CoastLowest | $3.70 | $66.60 |
| Rocky Mountain | $4.46 | $80.28 |
| West Coast | $5.42 | $97.56 |
| CaliforniaHighest | $5.89 | $106.02 |
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
- 18.0-gallon tank$76.86
- 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.
LeSabre tank size in other years
1990 is the first LeSabre model year we list.
| Model year | Tank | Longest highway range |
|---|---|---|
| 1995 LeSabre | 18.0 gal | 468 mi |
| 1994 LeSabre | 18.0 gal | 468 mi |
| 1993 LeSabre | 18.0 gal | 468 mi |
| 1992 LeSabre | 18.0 gal | 468 mi |
| 1991 LeSabre | 18.0 gal | 468 mi |
| 1990 LeSabre | 18.0 gal | 450 mi |
1990 Buick LeSabre vs similar 1990 sedans
At 18.0 gallons, the LeSabre's largest tank ranks third of the six 1990 sedans compared here. The Ford Thunderbird carries the most (19.0 gal) and the Pontiac Grand Prix the least (16.0 gal).
| 1990 model | Tank | Longest highway range |
|---|---|---|
| Ford Thunderbird | 19.0 gal | 456 mi |
| Mercury Cougar | 19.0 gal | 456 mi |
| Buick LeSabre | 18.0 gal | 450 mi |
| Oldsmobile Eighty-Eight Royale | 18.0 gal | 450 mi |
| Chevrolet Lumina | 16.5–17.1 gal | 428 mi |
| Pontiac Grand Prix | 16.0 gal | 432 mi |
Other 1990 sedans of a similar size, one model per brand.
1990 Buick LeSabre fuel pump and gauge parts
These are the part numbers the makers list for the 1990 Buick LeSabre. 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 1990 Buick LeSabre?
The 1990 Buick LeSabre holds 18.0 gallons (68 liters) on every trim we list.
How many gallons and liters does the 1990 Buick LeSabre gas tank hold?
The 1990 Buick LeSabre tank holds 68 liters, or 18.0 gallons in US gallons.
How far can a 1990 Buick LeSabre go on a full tank?
About 450 miles on the highway and 288 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 1990 Buick LeSabre go on a quarter tank?
About 113 highway miles or 72 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.
What gas does the 1990 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 1990 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 1990 Buick LeSabre?
About 112 pounds for the 18.0-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 1990 Buick LeSabre have a bigger gas tank than the Oldsmobile Eighty-Eight Royale?
No, they match: both top out at 18.0 gallons in 1990.
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.