Just google gas powered vehicle efficiency vs electric vehicle efficiency and you should get plenty of sources. Another way of comparing efficiencies is to look at the cost. According to energysage.com, the cost per mile for gas is about 3 times as much as for electricity to charge yur batteries. That reflects the difference in efficiency. Again, it's not even that simple. What you correctly imply is that you need to do a "total environmental warming impact" study (TEWI). I've done a few. But, they take a lot of work and I'm retired now, so won't be doing one here.
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