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Calculating
MPG
MPG can be calculated in four easy steps: Step 1. Filling the vehicle's gas tank completely and writing down the vehicle's odometer reading (mileage). Example: The last time the tank was filled, the odometer reading was 32,645.1 miles.
Example: The next time the tank was filled, the odometer reading was 33,001.3. It took 13.5 gallons to fill the tank.
Example: The distance driven would be 33,001.3 minus 32,645.1, or 356.2 miles.
Example: 356.2 miles divided by 13.5 gallons equals 26.4 miles per gallon. The MPG for that driving period would be 26.4. Alternate Method If you use your vehicle's trip odometer, MPG can be calculated by Step 1. Filling the vehicle's gas tank completely and resetting the trip odometer. Note: Sometimes it's easy to get the main odometer and trip odometer readings confused, especially if the vehicle is new. Step 2. When it's time to refuel Filling the tank completely Writing down the number of gallons it took to fill the tank Writing down the mileage on the trip odometer Resetting the trip odometer Example: It took 9.5 gallons to completely fill the tank, and the trip odometer reads 335 miles.
Example: 335 miles divided by 9.5 gallons equals 35.5 miles per gallon. 

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