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You would divide the number of miles you are going to go by the number of miles per gallon (mpg) that you get with your car.

My car averages 22 mpg. So, if I plan to drive 150 miles, I divide 150 by 22, which equals the number of gallons of gas that I'll need. I'll need 6.8, almost 7 gallons.

Another way to look at it, is that I have a 17 gallon gas tank. How far can I go, in miles? Multiply the 22 mpg times 17 and I know I can go about 374 miles before I have to fill up again. That is, if I don't drive unusually fast, make quick stops, or make other fuel-ish moves.

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14y ago

What else can I help you with?