- Newest year: 2004
- Gas
- Midsize cars
2000-2004 Buick Regal MPG & Fuel Cost
5 model years · 19–21 MPG combined
15,000 mi/yr · regular gasoline $4.36/gal (U.S. average, Sep 2026)
Cheaper to fuel than 6 of 10 midsize car configurations, MY2004. Ranked against all rated configurations, not sales-weighted.
2000-2004 Buick Regal at a glance
The 2000-2004 Buick Regal covers 5 model years in the EPA database (10 configurations in all), rated 19–21 MPG combined. The newest model year, 2004, costs about $3,110 a year to fuel for its most efficient version, the Regal 3.8L 6-cyl FWD (21 MPG), at regular gasoline $4.36/gal (U.S. average, Sep 2026). EPA changed the ratings in 2001, 2002 and 2004; 2003 repeat the values of the year before. The best combined rating in the generation, 21 MPG, was reached in 2000, 2001 and 2004.
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
2000-2004 Buick Regal by model year
| Model year | Powertrains | Combined | $/yr | EPA ratings |
|---|---|---|---|---|
| 2004 | Gas | 20–21 MPG | $3,110–$4,020 | Ratings changed |
| 2003 | Gas | 19–20 MPG | $3,270–$4,230 | Same EPA ratings as 2002 |
| 2002 | Gas | 19–20 MPG | $3,270–$4,230 | Ratings changed |
| 2001 | Gas | 20–21 MPG | $3,110–$4,020 | Ratings changed |
| 2000 | Gas | 19–21 MPG | $3,110–$4,230 | First year |
What the 2004 Regal 3.8L 6-cyl FWD costs to drive
Per month
$259
$3,110 a year ÷ 12
Per 25 miles
$5.18
Per 100 miles
$20.73
Five years
$15,550
5 × the yearly cost, prices held at today's level
vs the midsize car median
$330less a year
Class median $3,440 a year, MY2004
Based on 15,000 miles a year and regular gasoline $4.36/gal (U.S. average, Sep 2026).
2004 Buick Regal MPG
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
Versus 2003: The most efficient configuration moves from 20 to 21 MPG, up 1. Its annual cost goes from $3,270 to $3,110, $160 less.
Gas configurations (2)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| Regal 3.8L 6-cyl (Most efficient) | 3.8L 6-cyl | FWD | 18 | 28 | 21 | $3,110 |
| Regal 3.8L 6-cyl supercharged | 3.8L 6-cyl supercharged | FWD | 16 | 26 | 20 | $4,020 |
1 configuration requires or recommends higher-octane gasoline and is costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
2003 Buick Regal MPG
Same EPA ratings as 2002
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
EPA lists the same ratings for the 2003 Buick Regal as for the 2002 model, so the configurations and costs are the ones in the 2002 section above.See 2002
2002 Buick Regal MPG
19–20 MPG · $3,270–$4,230/yr
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
Versus 2001: The most efficient configuration moves from 21 to 20 MPG, down 1. Its annual cost goes from $3,110 to $3,270, $160 more.
Gas configurations (2)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| Regal 3.8L 6-cyl (Most efficient) | 3.8L 6-cyl | FWD | 17 | 27 | 20 | $3,270 |
| Regal 3.8L 6-cyl supercharged | 3.8L 6-cyl supercharged | FWD | 16 | 25 | 19 | $4,230 |
1 configuration requires or recommends higher-octane gasoline and is costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
2001 Buick Regal MPG
20–21 MPG · $3,110–$4,020/yr
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
Versus 2000: The most efficient configuration stays at 21 MPG. Its annual cost stays at $3,110.
Gas configurations (2)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| Regal 3.8L 6-cyl (Most efficient) | 3.8L 6-cyl | FWD | 17 | 28 | 21 | $3,110 |
| Regal 3.8L 6-cyl supercharged | 3.8L 6-cyl supercharged | FWD | 16 | 26 | 20 | $4,020 |
1 configuration requires or recommends higher-octane gasoline and is costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
2000 Buick Regal MPG
19–21 MPG · $3,110–$4,230/yr
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
Gas configurations (2)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| Regal 3.8L 6-cyl (Most efficient) | 3.8L 6-cyl | FWD | 17 | 27 | 21 | $3,110 |
| Regal 3.8L 6-cyl supercharged | 3.8L 6-cyl supercharged | FWD | 16 | 25 | 19 | $4,230 |
1 configuration requires or recommends higher-octane gasoline and is costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
Fuel cost by state
Yearly cost of the Regal 3.8L 6-cyl FWD: $4,230 in California and $2,710 in Texas, a $1,520 difference.
- California $4,230
- Washington $3,920
- New York $3,110
- Florida $2,940
- Texas $2,710
Similar cars
Closest combined MPG among MY2004 midsize car models.
Generations
- 2000-2004 (4th gen)
- 2011-2016
- 2017
- 2018-2020 (6th gen)
Frequently asked questions
What gas mileage does the 2000-2004 Buick Regal get?
EPA rates the 2000-2004 Buick Regal at 19–21 MPG combined across 10 configurations and 5 model years. The most efficient version, the 2004 Regal 3.8L 6-cyl FWD, is rated 21 MPG (18 city, 28 highway).
Which years had the best MPG in the 2000-2004 Buick Regal?
The Regal 3.8L 6-cyl FWD reached the generation's best combined rating, 21 MPG, in 2000, 2001 and 2004. The lowest top rating, 20 MPG, was in 2002 and 2003.
Did EPA ratings change during the 2000-2004 Buick Regal?
Yes. Ratings changed in 2001, 2002 and 2004. In 2003 the values repeat the year before.
How much does it cost to fuel a 2004 Buick Regal per year?
Driving 15,000 miles a year at regular gasoline $4.36/gal (U.S. average, Sep 2026), the Regal 3.8L 6-cyl FWD costs about $3,110 a year. Across all 2 configurations the cost runs $3,110–$4,020 a year. That is a $910 difference between the cheapest and the costliest configuration.
How much does it cost to drive a 2004 Buick Regal 100 miles?
About $20.73 per 100 miles for the Regal 3.8L 6-cyl FWD at regular gasoline $4.36/gal (U.S. average, Sep 2026), and between $20.73 and $26.80 across all configurations. That is the annual cost over 15,000 miles divided by 150.
Is the 2004 Buick Regal more efficient in the city or on the highway?
The Regal 3.8L 6-cyl FWD is rated 18 city and 28 highway MPG, so it is more efficient on the highway, by 10 MPG.
How does the 2004 Buick Regal compare with other midsize car configurations?
The Regal 3.8L 6-cyl FWD costs about $3,110 a year to fuel, $330 less than the class median of $3,440, and less than 6 of 10 midsize car configurations. The comparison covers all 119 rated midsize car configurations for MY2004, not weighted by sales.
Is the 2004 Buick Regal different from the 2003 model?
The most efficient configuration moves from 20 to 21 MPG, up 1. Its annual cost goes from $3,270 to $3,110, $160 less. EPA lists 2 configurations for 2004 against 2 configurations for 2003. See the 2003 Buick Regal for that year.