Why not NG?????? We have enough NG to last a 100 years. Cars can run on it buses, trucks and with out spending a arm or leg for modification. You can even have cars run on both gas and NG. My brother- in-law in England has a VoVo, that runs on both and he can go 500 miles between fill ups.
NG is produced in the states, by American workers and the money for energy isn't going over seas.