A Fuel Cell powers 50 units of work in a machine. When refueling machines you only have the option to load a whole Fuel Cell, even though you may not need all of the 50 units. Would it be possible to refuel machines based on units of work? This would ensure more efficient use of Fuel Cells for those who desire it.
It would probably require a revision of the refueling badges to reflect units of work refueled rather than whole Fuel Cells.