Average MPG is calculated by excluding the initial and missed fuel ups, then taking the difference between the min and max odometer reading and dividing it by total amount of gas consumed(if Metric then it is further divided by 1/100). This method will include all of the gas consumed by full and partial fuel ups.
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### Tracking Fuel Mileage across Different Fuel Grades / Gas Stations
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To track fuel mileage across different fuel grades, gas stations, etc, you can either rely on the tagging functionality or add an extra field to the gas record. Filtering the records by tags or via searching the records will automatically update the average, min, and max fuel mileage labels.
