3456162.4 = 55.4 lbs 12. Tiffany's current automobile averages 30 miles per gallon of gasoline. Gasoline costs $1.20 per gallon. She is thinking about buying a new car that averages 18 miles per gallon. If she drives 30,000 miles, how many more dollars will she have to spend on gasoline using the new car rather than the old one? new/old. 10

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