So it carries 770lb of fuel? (1980+770+770 = 3520).
Seeing it'll carry 770lb payload which includes an EO/IR turret plus armament it has 770lbs left for fuel.
Now I don't want to be sound pessimistic, but a 200hp engine, with 770lb of fuel is not going to last very long (considering the leading engine in 200hp-215hp category (Lycoming IO-390) burns fuel at around 13 GPH at around 75% power and 10 GPH at around 55% power) and a gallon of fuel weighs around 6lbs so if my math is right, at an average of 55% power during a mission, it has somewhere around 12 hours of mission endurance (that includes the whole take off and landing). Which isn't really that great if you compare it with other drones, but hey if we're building them here, and building them cheap, it's better than nothing.
BTW a Predator manages manages 24 hours off 870lbs of fuel with a smaller, more efficient Rotax 914 engine (albeit in a different configuration).
This is just my deduction from bits of information I found over the net, and based almost entirely on assumptions.