Original sentence: Lastly, the unit of measurement known as miles per gallon of gasoline equivalent or MPGe may be misleading, as illustrated here: The formula uses the full thermal energy in a gallon of gasoline to calculate the metric.The calculation assumes that the energy that drives the electric vehicle is produced by a generator that has perfect efficency (Note that the numerator in the equation is only slightly less than the total calorific chemical energy available in a gallon of petrol and not the amount of electricity that can ever be concievably generated from this gallon).This can not be justified as this means that, with the average 20% efficiency of gasoline vehicles, an electric car whose efficiency is calculated in this way will appear to be five times as efficient as any ICE due to the method of measuring efficiency
Edited sentence: It assumes that the energy that drives the vehicle is created 'magically' through a generator that has perfect efficency (Note that the numerator in the equation is only slightly less than the total calorific chemical energy available in a gallon of petrol and not the amount of electricity that can ever be concievably generated from this gallon).Lastly, the unit of measurement known as miles per gallon of gasoline equivalent or MPGe is patently absurd, as illustrated here: The formula uses the full thermal energy in a gallon of gasoline to calculate the metric.This can not be justified as this means that with the average 20% efficiency of gasoline vehicles any electric car whos efficiency is calculated in this way is going to be five times as efficient as any ICE simply by virtue of the way the efficiency is measured