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How much in CO2 emissions can be prevented in a given year if the entire U.S....

How much in CO2 emissions can be prevented in a given year if the entire U.S. passenger vehicle fleet (cars, SUV’s and pickup trucks) improves its gas mileage from 23 miles per gallon to 30 miles per gallon?

Assumptions: (1) There are about 200 million passenger vehicles in the U.S, (2) The average driving distance is 12,000 miles per year, (3) The carbon content of gasoline with a density of 6.2 lb/gallon is 86%.

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