The document lists 5 clean and fuel efficient cars - the 2010 Toyota Prius, Honda Civic Hybrid, Honda Insight, Ford Fusion Hybrid, and Mercury Milan Hybrid. All 5 cars receive high green vehicle ratings and pollution/greenhouse gas scores, with the Prius achieving the highest combined MPG of 50. The cars are praised for their fuel efficiency and clean emissions.

1. 5 Clean & Fuel Efficient Cars

2. #1 Toyota Prius, 2010 Green Vehicle Rating: 4.8 stars Air Pollution Score: 9.5 Greenhouse Gas Score: 10 Combined MPG: 50 mpg City MPG: 51 mpg Highway MPG: 48 mpg Engine Size: 1.8 L Cylinders: 4 Photo credit: Rudolf Stricker

3. #2 Honda Civic Hybrid Green Vehicle Rating: 4.8/5 stars Air Pollution Score: 9.5 Greenhouse Gas Score: 10 Combined MPG: 42 mpg City MPG: 40 mpg Highway MPG: 45 mpg Engine Size: 1.3 L Cylinders: 4 Photo credit: IFCAR

4. #3 Honda Insight Green Vehicle Rating: 4.8/5 stars Air Pollution Score: 9.5 Greenhouse Gas Score: 10 Combined MPG: 42 mpg City MPG: 40 mpg Highway MPG: 43 mpg Engine Size: 1.3 L Cylinders: 4 Photo credit: LSDSL

5. #4 Ford Fusion Hybrid Green Vehicle Rating: 4.8/5 stars Air Pollution Score: 9.5 Greenhouse Gas Score: 10 Combined MPG: 39 mpg City MPG: 41 mpg Highway MPG: 36 mpg Engine Size: 2.5 L Cylinders: 4 Photo credit: IFCAR

6. #5 Mercury Milan Hybrid Green Vehicle Rating: 4.8/5 stars Air Pollution Score: 9.5 Greenhouse Gas Score: 10 Combined MPG: 39 mpg City MPG: 41 mpg Highway MPG: 36 mpg Engine Size: 2.5 L Cylinders: 4 Photo credit: IFCAR