Actually they changed it to just 2. Look on the 2nd post on the main page.Another thing to keep in mind is there are actually three types of fuel (all seem to be hydrogen-based): Boost fuel accumulated by onboard fuel intakes of varying efficiency, QD fuel which must be refined or purchased and Jump fuel (not yet in game) which will need further refinement and whose storage capacity will come into play when we have multiple systems and different sized jump point requirements.
None of the ships yet have an inkling of their Jump fuel capacities except in general relative terms (The Dur, for instance is said to have extra jump fuel tanks and be capable of long-range mission).
For strategic planning, these long-legged exploration ships will be vital for the org, and it will be even more important to support them with both forward-based starfarers and escort elements.
At one point it was 3 but latest word is only 2 now.