CO₂ emissions: 17 of 17 variants rated.
Citroen C6 3.0i V6 Ligne Business tops the Citroen C6 ranking by CO₂ emissions, at 266 g/km.
Across 17 ranked variants, CO₂ emissions spans from 175 g/km to 266 g/km.
| # | Variant | Year | Body | Fuel | CO₂ emissions |
|---|---|---|---|---|---|
| 1 | Citroen C6 3.0i V6 Ligne Business | 2007 | Sedan | Petrol | 266 g/km |
| 2 | Citroen C6 3.0i V6 | 2006 | Sedan | Petrol | 266 g/km |
| 3 | Citroen C6 3.0i V6 Lignage | 2006 | Sedan | Petrol | 266 g/km |
| 4 | Citroen C6 3.0i V6 Exclusive | 2006 | Sedan | Petrol | 266 g/km |
| 5 | Citroen C6 2.7 HDiF V6 Ligne Business | 2007 | Sedan | Diesel | 230 g/km |
| 6 | Citroen C6 2.7 HDiF V6 | 2006 | Sedan | Diesel | 230 g/km |
| 7 | Citroen C6 2.7 HDiF V6 Lignage | 2006 | Sedan | Diesel | 230 g/km |
| 8 | Citroen C6 2.7 HDiF V6 Exclusive | 2006 | Sedan | Diesel | 230 g/km |
| 9 | Citroen C6 2.2 HDiF | 2008 | Sedan | Diesel | 199 g/km |
| 10 | Citroen C6 2.2 HDiF Serie Speciale | 2008 | Sedan | Diesel | 199 g/km |
| 11 | Citroen C6 2.2 HDiF Ligne Business | 2008 | Sedan | Diesel | 199 g/km |
| 12 | Citroen C6 3.0 HDiF V6 Ligne Business | 2009 | Sedan | Diesel | 195 g/km |
| 13 | Citroen C6 3.0 HDiF V6 Exclusive | 2009 | Sedan | Diesel | 195 g/km |
| 14 | Citroen C6 2.2 HDiF Ligne Business | 2007 | Sedan | Diesel | 175 g/km |
| 15 | Citroen C6 2.2 HDiF | 2006 | Sedan | Diesel | 175 g/km |
| 16 | Citroen C6 2.2 HDiF Lignage | 2006 | Sedan | Diesel | 175 g/km |
| 17 | Citroen C6 2.2 HDiF Exclusive | 2006 | Sedan | Diesel | 175 g/km |