CO₂ emissions: 11 of 11 variants rated.
Hummer H3 3.5 Comfort tops the Hummer H3 ranking by CO₂ emissions, at 369 g/km.
Across 11 ranked variants, CO₂ emissions spans from 314 g/km to 369 g/km.
| # | Variant | Year | Body | Fuel | CO₂ emissions |
|---|---|---|---|---|---|
| 1 | Hummer H3 3.5 Comfort | 2006 | SUV | Petrol | 369 g/km |
| 2 | Hummer H3 3.5 Comfort | 2005 | SUV | Petrol | 369 g/km |
| 3 | Hummer H3 3.5 Advantage+1 | 2005 | SUV | Petrol | 369 g/km |
| 4 | Hummer H3 3.5 Executive+1 | 2005 | SUV | Petrol | 369 g/km |
| 5 | Hummer H3 3.7 Adventure | 2007 | SUV | Petrol | 348 g/km |
| 6 | Hummer H3 5.3 V8 Luxury | 2008 | SUV | Petrol | 344 g/km |
| 7 | Hummer H3 3.7 Adventure | 2007 | SUV | Petrol | 330 g/km |
| 8 | Hummer H3 3.7 Luxury | 2007 | SUV | Petrol | 330 g/km |
| 9 | Hummer H3 3.7 | 2007 | SUV | Petrol | 320 g/km |
| 10 | Hummer H3 3.7 Luxury | 2007 | SUV | Petrol | 320 g/km |
| 11 | Hummer H3 3.7 | 2007 | SUV | Petrol | 314 g/km |