Least and Most Polluting Cars, 2011
Updated February 21, 2017 | Factmonster Staff 
The ACEEE's Green Book®, a buyer's guide to environmentally friendly passenger vehicles, rates cars according to their emissions and fuel consumption, and publishes an annual list of the "greenest" and "meanest" (i.e., most polluting).
| Greenest vehicles | MPG: city1 | MPG: hwy.1 | Green2 score |
|---|---|---|---|
| 1. Honda Civic GX | 24 | 36 | 54 |
| 2. Nissan Leaf | 3.15 | 2.72 | 54 |
| 3. Smart For Two Cabriolet / Smart For Two Coupe | 33 | 41 | 53 |
| 4. Toyota Prius | 51 | 48 | 52 |
| 5. Honda Civic Hybrid | 40 | 43 | 51 |
| 6. Honda Insight | 40 | 43 | 50 |
| 7. Ford Fiesta SFE | 29 | 40 | 50 |
| 8. Chevrolet Cruze Eco | 28 | 42 | 49 |
| 9. Hyundai Elantra | 29 | 40 | 49 |
| 10. Mini Cooper | 29 | 37 | 49 |
| Meanest vehicles | MPG: city | MPG: hwy. | Green2 score |
|---|---|---|---|
| 1. Bugatti Veyron | 8 | 15 | 19 |
| 2. Chevrolet Suburban K2500 / GMC Yukon XL K2500 | 10 | 15 | 20 |
| 3. Dodge Ram 2500 Mega Cab | 13 | 18 | 20 |
| 4. Chevrolet / GMC G2500 Express/ G2500 Savana | 10 | 16 | 20 |
| 5. Ford F-250 | 12 | 16 | 20 |
| 6. Ford F-150 Raptor | 11 | 14 | 20 |
| 7. Mercedes-Benz ML 63 AMG | 11 | 15 | 21 |
| 8. Mercedes-Benz G 550 | 11 | 15 | 21 |
| 9. GMC Sierra K2500 | 12 | 17 | 21 |
| 10. Bentley Mulsanne | 11 | 18 | 22 |
NOTE: MPG = miles per gallon. 1. Fuel economy for electric vehicles is provided in miles per kilowatt-hour. 2. The green score runs on a scale from 0 to 100. The top vehicle this year scored a 54, and the worst gas-guzzler scored 19. The score is based on automakers' test results for fuel economy and emissions as reported to the EPA, as well as an estimate of pollution from vehicle manufacturing, from the production and distribution of fuel, and from vehicle tailpipes. It also factors in air pollution. Source: Web: American Council for an Energy-Efficient Economy (ACEEE).
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