@richtea999, I was referring to the readability issue. The arrows would be a nice touch indeed. Even better would it be to see a number of the distance it deviates from the route (however a lot more complicated I suppose).
and like @Nick-Carthew, says, the total distance calculated over the road would be ideal. The combination of those figures would take the guesswork out of the choice completely.
Station A would say: Probably on the other side of a river (Nick's example)
Station B would say: Distance (over the road) is very nearby but the deviation from the route is substantial
Station C would say: A little bit farther from where you are but much closer to the route
Station D would say: A little bit farther but exactly on the route, no deviation necessary
A lot of calculation going on for such an overview. But if you are in need of a gas station, probably only the 5 closest ones will have your interest. That could limit the options. Perhaps with a button "search for more".