v1.5
Something is fishy about fuel tankers. The standing order 'Move to Gas Giant with Sorium' does not appear to work. The tanker stays at the colony, with no orders, with a sorium gas giant in-system. Equally, 'Transfer Fuel to Colony' conditional order does not appear to work, again no orders issued. Lastly, when I manually ordered my tanker to transfer fuel to colony, it transferred 100% of it's fuel to the colony, and did not retain the 5% which I set in it's design.
Back in v1.4, the 'transfer fuel to colony' part was working correctly, though the standing order was not. This is using a colony in another system, not my homeworld. But it has refueling ability, and a small population.