PieChaser, Mechta, & MaxTakeoff - good informative posts there guys
tests by Bond and two other EC135 operators in Europe found possible similar supply-tank fuel gauging errors that overestimated the fuel on board.
That is the statement that concerns me most...
Dipping the tanks.
I've searched the thread and not spotted this being discussed. My experience has been that despite gauges, calculations and paperwork one should always dip the tanks regularly to see how much is actually in there.
OK fixed wing not rotary but on annual we always drained the tanks and "started again".
SGC - a question for an engineer to answer, its not something the pilot can do.