I think we already have a problem by allowing gasoline and diesel powered vehicles to mix. Gasoline and diesel are different fuels, with different BTU ratings per unit volume (diesel has more), so comparisons are not completely level. When we add electricity we have another different "fuel." When we use some of the so-called mpg equivalents we have politically driven "equivalents" which apparently are designed to give electric vehicles an advantage.
Electricity as delivered to a residence has about 20% to 25% of the energy originally consumed as fossil fuel. This is fairly comparable to the energy efficiency of a gasoline engine as installed in a car. That is taken into account in its price. However, electricity as delivered to a house does not include road use taxes, part of the price of gas or diesel. Once government figures a way to tax the electricity, its advantages will disappear.
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