Nope, all the same. Here's my theory on the problem- the router is going to select a route for 'fastest' by going with the longest jump for your fuel you can get at present, in the direction of your goal. Because the direction of my goal for the longer route wasn't the same as the direction for the 'to the middle' route, it selected a different route, and close to the end, it failed to come up with a final jump or two that would fit. It appears the router will only back off a jump or two before failing, and in this case it would have had to back up six or eight jumps to match routes with the prior.
The routing computer is a bit of <sigh> in the game.