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You can figure out how much money you're spending on gas by keeping and examining financial records. Look at debit or credit card transactions online and count how much you spent at gas stations. If you pay cash, mark down the amount each time you fill up at the gas station.

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9y ago
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14y ago

Totally fill up your tank. When you totally fill up the very next time, look on the pump to see how many gallons that you put in. Take the total miles driven in that period and divide the number of gallons. You will get MPG (Miles Per Gallon) Example. Fill up. Drive 300 miles. Fill up again. Check gallons on pump. Say it's 15. 300/15 = 20 MPG.

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Q: How do you calculate how many gallons of gas you use?
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