Original sentence: It is most applicable to higher-capacity vehicles such as trains, as the occupancy of personal vehicles is typically considerably lower than capacity and may therefore result in an unrepresentative value.Passenger Miles Per Gallon (PMPG) a metric to evaluate the energy efficiency of a vehicle
Edited sentence: In this global warming age, we must think in terms of Passenger Miles Per Gallon (PMPG).It is not enough to note the vehicles MPG any longer.PMPG - Passenger Miles Per Gallon.This is a new metric to evaluate the energy efficiency of our vehicles