he original design. This plane has 6 Aux tanks, holds 65,326 lbs. of fuel„ according to their Chief Pilot Fred Polino its 5,200nm range. Equates to 12.5hours till flame out and useful hang time of 11.5hours with 1 hour fuel reserve., If you installed one more Aux tank, you gain approx 3,564Ibs of fuel,. O