Problem: Assume there are 100 million passenger cars in the United States and the average fuel efficiency is 20 mi/gal of gasoline. If the average distance traveled by each car is 10,000 mi/yr how much gasoline would be saved per year if the average fuel efficiency could be increased to 25 mi/gal?

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Assume there are 100 million passenger cars in the United States and the average fuel efficiency is 20 mi/gal of gasoline. If the average distance traveled by each car is 10,000 mi/yr how much gasoline would be saved per year if the average fuel efficiency could be increased to 25 mi/gal?