Prossibly not a popular opinion though: How about a larger Jet Energy pool, but no regen?
You'd either have to savage partially used cells, in-field crafting low grade fuel/energy or hightail it back to an Ammo station.
I liked the idea of the fuel being a more long term managed resource, in the Attack on Titan games. As it leads to making combat (whether or not to engage or retreat) decisions and desperate situations (if mismanaged).
It would increase the variety of world with more world props (dead patrols, downed mechs etc.) and a useful reward for missions. Having the crafting of Jet energy for dire times (so players aren't completely out of options).
The limiting factor, if needed, could be explained away by heat management - since we're in mechs, it would bring alittle bit more Battletech style of mech. That way you keep the limited tank currently offered by the small pool that regenerates, but you also have to concern your self with fuel burning in the long term.
HOWEVER this only makes sense if you want to bring back the Ammo limitation from Firefall. If ammo isn't a problem I don't see why fuel would be an issue. Just some food for thought.
Hope to see Em8er succeed, where Firefall 0.91v left off ! ! !