- Gas
- Midsize cars
- MY2000–2005
Buick Century MPG & Fuel Cost by Year
6 model years · 2000–2005
15,000 mi/yr · regular gasoline $4.36/gal (U.S. average, Sep 2026)
Buick Century fuel economy at a glance
EPA has rated the Buick Century for 6 model years, 2000 to 2005. Across those years its combined rating runs 21 MPG. The latest model year, 2005, has 1 configuration rated 21 MPG combined and costing $3,110 a year to fuel at regular gasoline $4.36/gal (U.S. average, Sep 2026). The most efficient configuration on record since 2000 is the 2005 Century 3.1L 6-cyl FWD, at 21 MPG. EPA ratings go back to 1984: the earliest rating on this page is 25 MPG in 1984.
Buick Century MPG by year
Costs use the current EIA price set and 15,000 miles a year for every year, so years are comparable. Green marks the best year for each powertrain.
Buick Century generations
1 generations between 2000 and 2005. Open one for the table of every model year and configuration.
2005 powertrain options
Buick Century MPG history, 1984–1999
| Year | Gas (MPG) | Diesel (MPG) |
|---|---|---|
| 1999 | 21 | — |
| 1998 | 21 | — |
| 1996 | 21–24 | — |
| 1995 | 20 | — |
| 1994 | 20–24 | — |
| 1993 | 19–23 | — |
| 1992 | 19–22 | — |
| 1991 | 19–22 | — |
Show 7 more years
| Year | Gas (MPG) | Diesel (MPG) |
|---|---|---|
| 1990 | 20–23 | — |
| 1989 | 20–23 | — |
| 1988 | 20–24 | — |
| 1987 | 19–23 | — |
| 1986 | 19–23 | — |
| 1985 | 18–24 | 26–27 |
| 1984 | 18–23 | 24–25 |
EPA re-estimated the ratings of pre-2008 vehicles under its 2008 method; these are the re-estimated values.
More Buick models
Frequently asked questions
What is the Buick Century's gas mileage by year?
EPA combined ratings for the Buick Century run 21 MPG across model years 2000 to 2005. The latest year, 2005, is rated 21 MPG.
Which Buick Century model year has the best gas mileage?
The 2005 Buick Century Century 3.1L 6-cyl FWD has the highest combined rating since 2000, at 21 MPG.
How much does a Buick Century cost to fuel per year?
For MY2005, EPA-rated configurations cost $3,110 a year to fuel, driving 15,000 miles at regular gasoline $4.36/gal (U.S. average, Sep 2026). The most efficient one costs $3,110.
Has the Buick Century's fuel economy improved over time?
Not much. The most efficient configuration is rated 21 MPG in both 2000 and 2005. Going back further, the best rating in 1984 was 25 MPG.
Which Buick Century model years have the same ratings?
EPA lists identical ratings as the previous year for 2002, 2003, 2005. The generation pages mark those years "same EPA ratings" and point to the year that holds the full table.