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If you do not start with a full tank and at one point fill the tank again then you have no idea how much fuel you have actually used. If you are only wanting to put $20 in each time then fill once do your $20 fuel adding and keep track of the miles and gals till you completely fill the tank. Then you can take the total miles and divide by the total fuel to get an actual MPG.
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"It's not rocket surgery!" -MetroMPG
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