Least and Most Polluting Cars, 2014
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. MERCEDES-BENZ SMART ELECTRIC DRIVE CONVERTIBLE / COUPE | 3.61 | 2.77 | 59 |
| 2. TOYOTA PRIUS C | 53 | 46 | 57 |
| 3. NISSAN LEAF | 3.75 | 3.01 | 55 |
| 4. TOYOTA PRIUS | 51 | 48 | 55 |
| 5. HONDA CIVIC HYBRID | 44 | 47 | 55 |
| 6. LEXUS CT 200H | 51 | 48 | 55 |
| 7. TOYOTA PRIUS PLUG-IN HYBRID | 3.9/51 | 3.0/49 | 55 |
| 8. MITSUBISHI MIRAGE | 37 | 44 | 54 |
| 9. HONDA CIVIC NATURAL GAS | 27 | 38 | 54 |
| 10. HONDA INSIGHT | 41 | 44 | 53 |
| 11. MERCEDES-BENZ SMART FORTWO CONVERTIBLE/COUPE | 34 | 38 | 53 |
| 12. VOLKSWAGEN JETTA HYBRID | 42 | 48 | 53 |
| Meanest vehicles | MPG: city | MPG: hwy. | Green2 score |
|---|---|---|---|
| 1. CADILLAC ESCALADE ESV | 13 | 18 | 23 |
| 2. LAMBORGHINI AVENTADOR ROADSTER | 10 | 16 | 23 |
| 3. ROLLS-ROYCE PHANTOM EWB | 11 | 19 | 23 |
| 4. ROLLS-ROYCE PHANTOM DROPHEAD COUPE | 11 | 19 | 23 |
| 5. FORD EXPEDITION FFV/LINCOLN NAVIGATOR FFV | 13 | 18 | 22 |
| 6. FORD F-150 RAPTOR | 11 | 16 | 22 |
| 7. MERCEDES-BENZ G550 | 12 | 15 | 22 |
| 8. MERCEDES-BENZ G63 AMG | 12 | 14 | 21 |
| 9. BENTLEY MULSANNE | 11 | 18 | 21 |
| 10. FORD E-350 WAGON FFV | 12 | 16 | 21 |
| 11. BUGATTI VEYRON | 8 | 15 | 19 |
| 12. RAM 2500 | 13 | 18 | 18 |
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 59, and the worst gas-guzzler scored 23. 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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