Interesting, your cruiser seems to be able to burn through it's entire fueltanks in 16 days, a good 7 million liters.
What's your current fuel production rates at all locations? You might not have enough fuel being produced in-system to actually run these machines.
In fact, the entire fleet is going to end up blowing through tens of millions of liters of fuel, if not more, just from moving from system to system.