One electric car, roughly speaking, will use about 3000 kWh to go about 12,000 miles.
That means the electricity alone we use to refine petroleum each year could drive over 16,000,000 electric cars 12,000 miles each year.
And that doesn't include the electricity used in oil extraction and pumping.
[Source: Energy Statistics Database | United Nations Statistics Division under "Total Electricity" then "Consumption by petroleum refineries"]