I've heard that diesel fuel can be made from coal. The price would correspond to making diesel from crude oil at $45 a barrel. My source for that number is the Governor of Montana. The US is switching to Europe’s clean diesel standard so this might be the time to do it. Coal diesel and biodiesel might be a good combo.
The oil markets could nix this by dropping to $30 again. We would need to place tariffs on oil imports below $50 to protect the domestic investments. The US with $60 a barrel oil is managing well enough. We can sustain our economy at this price and turn our backs on the Middle East.