2003 Buick Regal Gas Tank Size & Fuel Capacity
Fuel tank capacity
17.0gal · 64 L
The 2003 Buick Regal has a fuel tank capacity of 17.0 gallons (64 liters) on every trim.
A full tank is good for roughly 425–459 highway miles or 272–289 miles around town, going by the EPA ratings.
17.0 gal · Smaller than 72% of 2003 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
2003 Buick Regal fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Engine
- no difference
All 2 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | Fuel | MPG city / hwy | Range city / hwy |
|---|---|---|---|---|---|---|
| GS 4dr Sedan 3.8L 6cyl S/C 4A · FWD · Premium (required) MPG 16 / 25Range 272 / 425 mi | 3.8L 6cyl S/C 4A | FWD | 17.0 gal64 L | Premiumrequired | 16 / 25 | 272 / 425 mi |
| LS 4dr Sedan 3.8L 6cyl 4A · FWD · Regular MPG 17 / 27Range 289 / 459 mi | 3.8L 6cyl 4A | FWD | 17.0 gal64 L | Regular | 17 / 27 | 289 / 459 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 2003 Buick Regal 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 20 MPG, a full 17.0-gallon tank covers about 340 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 17.0 | 459 | 289 |
| 3/4 | 12.8 | 344 | 217 |
| 1/2 | 8.5 | 230 | 145 |
| 1/4 | 4.3 | 115 | 72 |
| 1/8 | 2.1 | 57 | 36 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 750 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
- 19–20 MPG
- Tailpipe CO2
- 444–468 g/mi
- Source
- EPA ratings
What it costs to fill up a 2003 Buick Regal
$89.76 to fill the 17.0-gallon tank from empty with premium, at this week's US average of $5.28 a gallon.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 17.0 gal | Premium | $5.28 | $89.76 | $67.32 |
| 17.0 gal | Regular | $4.27 | $72.59 | $54.44 |
By region, 17.0-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $83.81 |
| Midwest | $5.37 | $91.29 |
| Gulf CoastLowest | $4.57 | $77.69 |
| Rocky Mountain | $5.12 | $87.04 |
| West Coast | $6.08 | $103.36 |
| CaliforniaHighest | $6.36 | $108.12 |
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
- 17.0-gallon tank$89.76
- A year of driving (15,000 mi)$3,960
Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.
Regal tank size in other years
The tank changed for 2003: 17.0 gal, down from 17.5 gal on the 2002 Regal.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2014 Regal | 18.0 gal | 540 mi |
| 2013 Regal | 15.8–18.0 gal | 569 mi |
| 2012 Regal | 18.0 gal | 558 mi |
| 2011 Regal | 18.0 gal | 540 mi |
| 2004 Regal | 17.0 gal | 476 mi |
| 2003 Regal | 17.0 gal | 459 mi |
| 2002 Regal | 17.5 gal | 473 mi |
| 2001 Regal | 17.5 gal | 490 mi |
| 2000 Regal | 17.5 gal | 473 mi |
| 1999 Regal | 17.5 gal | 473 mi |
| 1998 Regal | 17.0 gal | 459 mi |
2003 Buick Regal vs similar 2003 sedans
The Regal has the smallest tank of the seven 2003 sedans compared here: 17.0 gallons, against 19.0 for the Mitsubishi Diamante.
| 2003 model | Tank | Longest highway range |
|---|---|---|
| Mitsubishi Diamante | 19.0 gal | 437 mi |
| Hyundai XG350 | 18.5 gal | 444 mi |
| Nissan Maxima | 18.5 gal | 481 mi |
| Mazda 6 | 18.0 gal | 522 mi |
| Pontiac Grand Prix | 17.5 gal | 473 mi |
| Oldsmobile Aurora | 17.5 gal | 420 mi |
| Buick Regal | 17.0 gal | 459 mi |
Other 2003 sedans of a similar size, one model per brand.
2003 Buick Regal fuel system recalls
None of the 3 recalls NHTSA lists for the 2003 Buick Regal involve the fuel system.
2003 Buick Regal fuel pump and gauge parts
NHTSA lists no fuel-system recall for the 2003 Buick Regal, 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 2003 Buick Regal?
The 2003 Buick Regal holds 17.0 gallons (64 liters) on every trim we list.
How many gallons and liters does the 2003 Buick Regal gas tank hold?
The 2003 Buick Regal tank holds 64 liters, or 17.0 gallons in US gallons.
How far can a 2003 Buick Regal go on a full tank?
About 425–459 miles on the highway and 272–289 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 2003 Buick Regal go on a quarter tank?
About 115 highway miles or 72 in town from the 17.0-gallon tank, which has roughly 4.3 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2003 Buick Regal take?
Premium unleaded (required), or Regular unleaded, depending on the engine. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2003 Buick Regal?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 17.0-gallon tank from empty costs $89.76. It ranges from $77.69 in the Gulf Coast to $108.12 in California.
How much does a full tank of gas weigh in a 2003 Buick Regal?
About 105 pounds for the 17.0-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2003 Buick Regal have a bigger gas tank than the Mitsubishi Diamante?
No. The 2003 Mitsubishi Diamante holds up to 19.0 gallons; the 2003 Buick Regal holds up to 17.0.
Has the 2003 Buick Regal had a fuel pump or fuel system recall?
No. None of the 3 recalls NHTSA lists for the 2003 Buick Regal 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 (Buick 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.