High Quality Content by WIKIPEDIA articles! Passenger miles per gallon (PMPG) is a metric to evaluate the energy efficiency of a vehicle or transportation mode. The PMPG can be obtained by multiplying the miles per gallon of fuel (MPG) by the passenger capacity or average occupancy. The occupancy of personal vehicles is typically lower than capacity by a considerable degree and thus the values computed based on capacity and on occupancy will often be quite different.Energy conversion efficiency is the ratio between the useful output of an energy conversion machine and the input, in energy terms.

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