One potentially interesting option that the author hasn’t tried is a yacht. Anybody seen any accounts of a cruising digital nomad?
Sarah Steenland the Cruising Cartoonist has been working a digital artist job and raising a family on sailboats for years in the South Pacific: https://www.sarahsteenland.com/
US grid losses are about 5% [1] and charging loses another 10-15%, and the motors are at least 90% efficient.
Meanwhile, automotive diesel engines lose 60% straight out the exhaust pipe, and that's not counting the energy required to refine and transport the diesel.