And wet feet...
I suspect the range they've used doesn't adequately account for the fuel burned in actual combat, or the effect of flying at the speed of the bomber formation. Checking, the distance looks about right for a Bf109E without drop tank. For practical combat operations, you could reckon on losing as much as half that radius.
The Spitfire I had about the same range. And by the Battle of Britain the RAF was using constant-speed propellers (think of this as a gearbox for coupling the engine to the air).