Original sentence: Electric vehicles charged from dirty sources of electricity will still result in significant pollution, while those charged from clean sources will not.For comparison the well-to-station efficiency of the automotive gasoline industry is 83%.In the USA the net pollution from an electric car will usually be about the same per mile driven as the pollution that results from driving internal-combustion vehicles, since more than 70% of the electrical energy in the USA is made by burning dirty coal, clean coal, natural gas or oil, and the well to wall-socket efficiency of the electrical generating system is only 52% at best, hence increasing the pollution for a given kWh at the vehicle by Z%.This is offset by the increased efficiency of the electrical vehicle itself
Edited sentence: , the sources are mixed; the net pollution will usually be much less than the pollution that results from driving internal-combustion vehicles, unless the source is based on coal or dirty oil.Electric cars are expected to be cheaper to make and maintain than internal combustion engine vehicles because they have many fewer parts.Electric vehicles charged from dirty sources of electricity will still result in significant pollution, at the power plant, while those charged from clean sources will not.However, attributing the pollution of the electricity generation to an EV is only fairly applicable, if also applying the pollution caused by the drilling, refining, and transporting of gasoline to the pump to the non-electric vehicle.In most regions of the U