Not exactly a fuel crunch, but a sorium crunch. I still have about 150 million liters stockpiled, but I had been running training sessions until the ships were at 50% fuel - each has a fuel capacity of 500k, so 250k*12 ships is ~4 million every half-year or so. Right now, after some research, I can produce 12 million a year, costing over 6000 tons of sorium. I'm pretty certain I'm not mining that much, and the only body I've colonized with actual people that has sorium is Mars with ~2 million at 0.1 accessibility. That's mainly why I'm putting so much effort into Europa: aside from being a good fuel drop-off from Jupiter, it has 900k sorium at 0.8.
The only other place in Sol that has decent sorium deposits is Uranus' moon Ariel, which is already taken by the civilian sector.
EDIT: Europa is finished terraforming. Colony cost is zero, and the first wave of colonists from Earth and an overpopulated Mars are coming in. No infrastructure was placed. I can only assume the slogan for our colonist corps is "It's free real estate." I mean, it's a shit atmosphere, 0.99atm of CO2, 0.11atm of oxygen sounds like a pile of lung cancer, but apparently it works.
Lalande 21185-A II one jump over should be trivial to terraform. It already has an acceptable temperature and a thin N/O atmosphere I can work with.