Most of the time driving my EV, I go at least 24 miles on 6kWh, and sometimes well over 30 miles.
Plus, that is just for refining the gasoline. Extraction also takes a lot of electricity, especially for fracking, and for tar sands bitumen. Deep water drilling takes a lot of energy, as well. Exploration to find the oil in the first place, and transportation - pumping oil through pipelines is non-trivial; again it is even harder with tar sands bitumen.
The numbers I have heard range between 7.5kWh and 13kWh of electricity used per gallon for the total process; depending on the oil type.
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