- Newest year: 2005
- Gas
- Midsize cars
- Same as 2004
2000-2005 Buick Century MPG & Fuel Cost
6 model years · 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, MY2005. Ranked against all rated configurations, not sales-weighted.
2000-2005 Buick Century at a glance
The 2000-2005 Buick Century covers 6 model years in the EPA database (6 configurations in all), rated 21 MPG combined. The newest model year, 2005, costs about $3,110 a year to fuel for its most efficient version, the Century 3.1L 6-cyl FWD (21 MPG), at regular gasoline $4.36/gal (U.S. average, Sep 2026). EPA changed the ratings in 2001 and 2004; 2002, 2003 and 2005 repeat the values of the year before.
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
2000-2005 Buick Century by model year
| Model year | Powertrains | Combined | $/yr | EPA ratings |
|---|---|---|---|---|
| 2005 | Gas | 21 MPG | $3,110 | Same EPA ratings as 2004 |
| 2004 | Gas | 21 MPG | $3,110 | Ratings changed |
| 2003 | Gas | 21 MPG | $3,110 | Same EPA ratings as 2002 |
| 2002 | Gas | 21 MPG | $3,110 | Same EPA ratings as 2001 |
| 2001 | Gas | 21 MPG | $3,110 | Ratings changed |
| 2000 | Gas | 21 MPG | $3,110 | First year |
What the 2005 Century 3.1L 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, MY2005
Based on 15,000 miles a year and regular gasoline $4.36/gal (U.S. average, Sep 2026).
2005 Buick Century MPG
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 2005 Buick Century as for the 2004 model, so the configurations and costs are the ones in the 2004 section above.See 2004
Gas configurations (1)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| Century (Most efficient) | 3.1L 6-cyl | FWD | 18 | 27 | 21 | $3,110 |
2004 Buick Century MPG
21 MPG · $3,110/yr
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 stays at 21 MPG. Its annual cost stays at $3,110.
Gas configurations (1)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| Century (Most efficient) | 3.1L 6-cyl | FWD | 18 | 27 | 21 | $3,110 |
2003 Buick Century 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 Century as for the 2002 model, so the configurations and costs are the ones in the 2002 section above.See 2002
2002 Buick Century MPG
Same EPA ratings as 2001
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 2002 Buick Century as for the 2001 model, so the configurations and costs are the ones in the 2001 section above.See 2001
2001 Buick Century MPG
21 MPG · $3,110/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 (1)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| Century (Most efficient) | 3.1L 6-cyl | FWD | 18 | 26 | 21 | $3,110 |
2000 Buick Century MPG
21 MPG · $3,110/yr
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
Gas configurations (1)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| Century (Most efficient) | 3.1L 6-cyl | FWD | 18 | 27 | 21 | $3,110 |
Fuel cost by state
Yearly cost of the Century 3.1L 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 MY2005 midsize car models.
Generations
- 2000-2005 (6th gen)
Frequently asked questions
What gas mileage does the 2000-2005 Buick Century get?
EPA rates the 2000-2005 Buick Century at 21 MPG combined across 6 configurations and 6 model years. The most efficient version, the 2005 Century 3.1L 6-cyl FWD, is rated 21 MPG (18 city, 27 highway).
Which years had the best MPG in the 2000-2005 Buick Century?
Every model year of the 2000-2005 Buick Century tops out at 21 MPG combined, so no year is better than another.
Did EPA ratings change during the 2000-2005 Buick Century?
Yes. Ratings changed in 2001 and 2004. In 2002, 2003 and 2005 the values repeat the year before.
How much does it cost to fuel a 2005 Buick Century per year?
Driving 15,000 miles a year at regular gasoline $4.36/gal (U.S. average, Sep 2026), the Century 3.1L 6-cyl FWD costs about $3,110 a year. Across all 1 configuration the cost runs $3,110 a year.
How much does it cost to drive a 2005 Buick Century 100 miles?
About $20.73 per 100 miles for the Century 3.1L 6-cyl FWD at regular gasoline $4.36/gal (U.S. average, Sep 2026). That is the annual cost over 15,000 miles divided by 150.
Is the 2005 Buick Century more efficient in the city or on the highway?
The Century 3.1L 6-cyl FWD is rated 18 city and 27 highway MPG, so it is more efficient on the highway, by 9 MPG.
How does the 2005 Buick Century compare with other midsize car configurations?
The Century 3.1L 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 114 rated midsize car configurations for MY2005, not weighted by sales.
Is the 2005 Buick Century different from the 2004 model?
No. EPA lists the same ratings for 2004 and 2005: 1 configuration rated 21 MPG combined. See the 2004 Buick Century for that year.