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for a person who drives his car 15000 miles a year trading in a car that gets 15 miles per gallon for a car that gets 18 miles per gallon (a 20% increase) will save them how many gallons of gas each year?
9 years ago

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Steve
15000/15 - 15000/18 = 166.67

or, since the old car used 1000 gallons, the new car, with 20% (6/5) better mileage uses 5/6 as much gas, saving 1/6 of 1000 = 166.67 gallons.
9 years ago

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