Partial Fill Ups
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The data entry area on the Fuel Log tab includes a checkbox for "Complete Fill Up". This checkbox is used to indicate whether the fill up is Complete or Partial. The fuel efficiency will not be calculated for a partial fill up, since it is unknown how much fuel was used for the distance driven; however, the fuel volume and the odometer change values will be included in the Fuel Efficiency calculation for the next fill up and for the overall fuel efficiency.
Example "miles per gallon" fuel efficiency calculations with partial fill ups:
Overall Fuel Efficiency = Total Odometer Change / Total Volume of fuel used
Overall Fuel Efficiency = 300 / 30
Overall Fuel Efficiency = 10