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Instead of far flung operations with massive and expensive distibution systems and complicated refineries, and the added complication of dealing with 100's of millions of uneducated and unhappy customers, the oil companies would be able to radically streamline their operations, realize enormous economies of scale, and deal with only about 100 customers who know their business.
Or did you forget that there is no such thing as an electric car, only cars that run on oil, coal, or nuclear power? And before you bring up solar, remember that there is not enough real estate on the planet to support enough solar panels to meet our needs.
Every solution to the problem of energy used in transportation is still in the future. Lots of people love nuclear power, but nobody wants a fission reactor within 50 miles of them and fusion is years away. Solar could actually work, but not until we rebuild our space program, convert the energy into electricity outside the atmosphere, and figure out how to get it down here. Hydrogen is expensive and possibly dangerous. We need to start now, needed to start in the early 70's, but please don't think the solutions are at our fingertips.