Interestingly, I have recently had to advise a tanker designer that it is vital for accurate offload figures to be available to the receiver.
This is because the manufacturer has an aircraft which can accept Jet A, Jet A-1 and Jet B yet has instructed the AAR system supplier to use a single fixed mid-range value for assumed fuel density (although this is corrected in flight for actual fuel temperature).
The net result is that the value displayed on the pod control system could be in error by up to 5.6% compared with the value deduced from the tanker fuel quantity indicators..... So Where Has All The Fuel Gone? Is it swilling around inside a receiver between probe and tanks (hands up all those who want a fuel cooled AI radar....) - or has it leaked out to atmosphere?
My advice is that accurate fuel offload values to each and every receiver are absolutely essential. Does anyone see this as being too picky?