1991 Buick Reatta Gas Tank Size & Fuel Capacity
Fuel tank capacity
18.8gal · 71 L
The 1991 Buick Reatta has a fuel tank capacity of 18.8 gallons (71 liters) on every trim.
A full tank is good for roughly 470 highway miles or 301 miles around town, going by the EPA ratings.
18.8 gal · Bigger than 55% of 1991 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
- Other years
- Compared
- Pump & gauge parts
- FAQ
1991 Buick Reatta fuel tank capacity by trim
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| 2dr Convertible 3.8L 6cyl 4A · FWD MPG 16 / 25Range 301 / 470 mi | 3.8L 6cyl 4A | FWD | 18.8 gal71 L | 16 / 25 | 301 / 470 mi | |
| 2dr Coupe 3.8L 6cyl 4A · FWD MPG 16 / 25Range 301 / 470 mi | 3.8L 6cyl 4A | FWD | 18.8 gal71 L | 16 / 25 | 301 / 470 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 1991 Buick Reatta 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 18.8-gallon tank covers about 357 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 18.8 | 470 | 301 |
| 3/4 | 14.1 | 353 | 226 |
| 1/2 | 9.4 | 235 | 150 |
| 1/4 | 4.7 | 118 | 75 |
| 1/8 | 2.4 | 59 | 38 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 789 gallons, roughly 42 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 1991 Buick Reatta
$80.28 to fill the 18.8-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 |
|---|---|---|---|---|
| 18.8 gal | Regular | $4.27 | $80.28 | $60.21 |
By region, 18.8-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $75.58 |
| Midwest | $4.27 | $80.28 |
| Gulf CoastLowest | $3.70 | $69.56 |
| Rocky Mountain | $4.46 | $83.85 |
| West Coast | $5.42 | $101.90 |
| CaliforniaHighest | $5.89 | $110.73 |
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
- 18.8-gallon tank$80.28
- 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.
Reatta tank size in other years
The tank changed for 1991: 18.8 gal, up from 18.2 gal on the 1990 Reatta.
| Model year | Tank | Longest highway range |
|---|---|---|
| 1991 Reatta | 18.8 gal | 470 mi |
| 1990 Reatta | 18.2 gal | 455 mi |
1991 Buick Reatta vs similar 1991 convertibles
The Reatta has the largest tank of the three 1991 convertibles compared here, 18.8 gallons against 15.5 for the Chevrolet Camaro.
| 1991 model | Tank | Longest highway range |
|---|---|---|
| Buick Reatta | 18.8 gal | 470 mi |
| Chevrolet Camaro | 15.5 gal | 372 mi |
| Chrysler TC | 14.0 gal | 308 mi |
Other 1991 convertibles of a similar size, one model per brand.
1991 Buick Reatta fuel pump and gauge parts
These are the part numbers the makers list for the 1991 Buick Reatta. 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 1991 Buick Reatta?
The 1991 Buick Reatta holds 18.8 gallons (71 liters) on every trim we list.
How many gallons and liters does the 1991 Buick Reatta gas tank hold?
The 1991 Buick Reatta tank holds 71 liters, or 18.8 gallons in US gallons.
How far can a 1991 Buick Reatta go on a full tank?
About 470 miles on the highway and 301 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 1991 Buick Reatta go on a quarter tank?
About 118 highway miles or 75 in town from the 18.8-gallon tank, which has roughly 4.7 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 1991 Buick Reatta take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 1991 Buick Reatta?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 18.8-gallon tank from empty costs $80.28. It ranges from $69.56 in the Gulf Coast to $110.73 in California.
How much does a full tank of gas weigh in a 1991 Buick Reatta?
About 117 pounds for the 18.8-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 1991 Buick Reatta have a bigger gas tank than the Chevrolet Camaro?
Yes. The 1991 Buick Reatta holds up to 18.8 gallons; the 1991 Chevrolet Camaro holds up to 15.5.
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.