The death of Günther Prien
U-47 left Lorient (France) for her tenth patrol on 20 February 1941. Only four days later they attacked convoy OB 290 and sank four ships totalling 16,310 tons. The last radio message from U-47 was received on the morning of 7 March, giving a position south of Iceland in the North Atlantic.

It had been long supposed that U-47 was sunk with all hands (45) on 8 March 1941.

Günther Prien boarded U-47 for the last patrol on 20 February 1941.

This is now being questioned, as the traditional credit for U-47's sinking has always gone to the British destroyer HMS Wolverine, but new data suggests that this destroyer actually attacked Eckermann's UA, which was forced to withdraw with heavy damage.

It is now suspected that U-47 may have been hit by one of her own circling torpedoes. (Two US submarines in the Pacific are also believed to have been lost to the same sort of equipment failure.)

https://www.uboat.net/men/commanders/

There was only 16 squadrons of RAF fighters that used 100 octane during the BoB.
The Fw190A could not fly with the outer cannon removed.
There was no Fw190A-8s flying with the JGs in 1945.