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Determine the mileage between your starting point and your destination. Divide the mileage by the average miles-per-gallon attained by your vehicle to determine approximately how many gallons of fuel it will take to make the trip. Multiply the number of gallons by an average cost per gallon of fuel ($4.00 would be a fair avg).

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15y ago
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Q: How much does it cost to drive from St. Louis to Phoenix?
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