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That's the wrong question. Tank size does not determine fuel consumption. The only way to ACCURATELY determine fuel consumption is to fill the tank, drive as far as you dare on that tank of fuel, fill the tank again then calculate the mileage by the following:

Divide total miles driven on that tank of fuel by the number of gallons used.

M/G=MPG

Where:

M=miles driven on that tank of fuel

G=number of gallons required to REFILL the tank after driving those miles

MPG=miles per gallon

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Wiki User

16y ago

What else can I help you with?