See page 14, 15 of "Energy Efficiency in Air Transportation" by Arturo Benito, Gustavo Alonso. Table 2.3 gives MJ/pkm for the US. Fig 2.8 next page gives ranges

See page 14, 15 of "Energy Efficiency in Air Transportation" by Arturo Benito, Gustavo Alonso. Table 2.3 gives MJ/pkm for the US. Fig 2.8 next page gives ranges of efficiency for both passenger and freight. https://books.google.com/books?id=jJGZDgAAQBAJ&printsec=frontcover&dq=energy+efficiency+by+transportation+mode&hl=en&newbks=1&newbks_redir=0&sa=X&ved=2ahUKEwjrt9nIucblAhWEpFkKHRfvBFgQ6AEwAHoECAUQAg#v=onepage&q=energy%20efficiency%20by%20transportation%20mode&f=false https://books.google.com/books?id=jJGZDgAAQBAJ&printsec=fron... Back when "peak oil" was a thing, I was in several discussions about what it would take to electrify the US transportation networks, both passenger and freight, but I have not worked in transportation planning. Hydrogen-fueled intercity buses will be much easier to implement than anything else, especially if they are autonomous to reduce driver costs.