Passenger miles per gallon

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Passenger miles per gallon (PMPG) is a metric to evaluate the energy efficiency of a vehicle or transportation mode.[1] The PMPG can be obtained by multiplying the miles per gallon of fuel (MPG) by either the passenger capacity or the average occupancy.[2] The occupancy of personal vehicles is typically lower than capacity by a considerable degree [3][4] and thus the values computed based on capacity and on occupancy will often be quite different.

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