In my opinion, fuel consumption should depend on the size of the planet. The smaller planet has smaller gravity, which makes it easier to launch fleets and will cost less fuel. According to this, Fleet Save will be cheaper on moon than on the planet and it will be the next advantage of owning the moon. Base of the calculation of consuming fuel maybe mother planet (all mother planets have same diameter) and planets (or moons) with less or more diameter will be less or more consume of deuter, when fleet launching.
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