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How much in CO2 emissions can be prevented in a given year if all U.S. passenger...

How much in CO2 emissions can be prevented in a given year if all U.S. passenger vehicles improve their gas mileage from 23 miles per gallon to 30 miles per gallon?

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

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