The paper looks at energy expenditure for the purposes of travel. Of _course_ slower methods are more efficient. They didn't include ICBMs but those would be cr

The paper looks at energy expenditure for the purposes of travel. Of _course_ slower methods are more efficient. They didn't include ICBMs but those would be crazy expensive. That's it, that's the whole story. Adding calories for the "other stuff" that happens while travel is occurring is not part of the story.