NRCan fuel consumption ratings
Where the 2004 Buick Century ranks
A number like “8.5 L/100 km” means nothing on its own. This puts it against every other vehicle rated in Canada that year.
Your vehicle
Against every 2004 vehicle rated in Canada
73%more efficient than
Better than most. The 2004 Buick Century uses 11.1 L/100 km combined, ranking 227 of 897.
Within Mid-size
69%
More efficient than 69% of the 103 vehicles NRCan puts in this class for 2004.
- Best in class
- 5.1
- Class median
- 11.6
- This vehicle
- 11.1
- Worst in class
- 21.6
Tailpipe emissions
255 g/km
Cleaner than 73% of 2004 vehicles.
Tailpipe only. It does not count the emissions of producing the fuel, or of generating electricity for an electric vehicle — the EV comparison does account for the grid.
How this is measured: Ranked against vehicles of the same model year, not against everything ever rated — comparing a 2004 SUV with 2026 hybrids would rank the calendar rather than the car. Where a model has several rated versions, the median one is used.
Source: NRCan — Fuel consumption ratings. Data current as of 2026-08-11. 30,784 rated vehicles, 1995 to 2026.