Please show me documentation that it was a practiced tactic in WWII, ya know, dump %99 of fuel in that P51D so it could turn as tight as a 109G on the deck.  Or maybe the 109G did that against the Yak?  oh oh oh, I know, I bet the 262 pilots did it so they should climb better?  
Yeah.  Right.  I have not found any documentation showing any of that, let alone knowing of any planes that had that capability (I'm sure there were, but for dumping fuel in flight. Probably a long term storage thing done by ground crews).
This I do know: Aircraft in WWII, especially in the PTO went up with %100 fuel.  If able they took DT's, too.  None of this %25 or %50 fuel and DT BS.  I wich HTC would code it so that DT's cant be taken unless the internal tanks are %100.  That would remove another one of the gamey-game tactics that the arcade frequenters us.  Of the 100+ entries my grandfather has in his pilot logs only a few times he went up w/o %100 fuel and that was to ferry B17's from one airfield to another (NM to CA).  Otherwise, even in the 1 hr flights he made from one island base to another ferrying mail and supplies in any one of the many cargo planes he flew between combat missions his plane *always* had %100 fuel.