I'm not so sure - presumably these are going to be highway truck stops/gas stations. You're not going to leave one guy there alone and shut everything down when he goes on break, you're going to add another 1-2 people to the daily shift at an existing gas station, and share the extra load across them.

My numbers do break down in that one guy per shift probably can't fuel everything, so we might need to double it. (In states with locking pumps, he probably can, though.)