=+30. Carbon footprint. Here are data relating the carbon footprint (tons of CO2 per year) to the new Environmental Protection Agency (EPA) highway mileage for 82 family sedans as reported by the U.S. government (www

.fueleconomy.gov/feg/byclass.htm). The car with the highest highway mpg and lowest carbon footprint is the Toyota Prius.

Highway mpg 25 30 35 40 45 9.0 7.5 6.0 4.5 Carbon Footprint