[Luno13]

From what I can tell, the Betty may indeed have shortened range, but it's not so bad.

At 5000 meters, mixture 40%, supercharger stage 2, power and prop-pitch 45% and trimmed level, range was 1,800 kilometers. If I mess around a bit, I might be able to do better.

Wiki says the range was 2,852 km.

It's worth noting that even when selecting 100% fuel, the fuel gauges in the Betty don't show maximum capacity.

I will try some more tests.

PS - It's also worth mentioning that the AI seem to be very bad at fuel management. I've made a test a long time ago in which the AI flew the entire sortie for me and I ran out of gas a half-hour sooner than the rest of the flight.