The Arado is indeed a gas guzzler, and the two 300l tanks are quickly emptied.
But I found another bug: The numbers in the cockpit display indicating the external fuel tank status were jumping around wildly the whole time. For example: 145-131-139-126-137 ect. As more and more fuel was used up in the drop tanks, the higher the deviations went.
I even dropped one of the two tanks, but even with a single tank it was still jumping around.
The fuel tank gauge itself and the "Fuel remaining" on E6B were stable, though.
I was able to duplicate this several times.
It shows even on film, I will send it in.