My awnser would have been alot simpler, that no one hadn't thought about it before. But yes, Webmaster is right, In the end of the war Mustagns were capable to fly across Germany in any direction. Giving them pretty much extra time, unless they met with Me-262 and were forced to drop their feul tanks and return to base earlier. Me-262s were practically the only air power Luftwaffe had in '45 and it was impossible to hunt fighters with them, because they lost their speed when they took on strong manuvers. That left the fighter pilots quite bored I think. Some of them have discribed how they just helplessly looked how Me-262s just passed and went and took a dump at the bombers the allied fighters were supose to protect. (The usual tactic was to attack from the rear, because front and side attacks weren't possible due to too much speed)
Also Luftwaffe suffered a very serious lack of pilots in the second part of the war. They even started to trasnfer bomber pilots onto fighters and so on. It didn't work out well at all.
In the earlier parts of war in the Germany's skies, allied pilots always had to be ready that they were attacked on their way back. In 1943 and so, Luftwaffe's main problem wasn't the lack of air craft nor pilots or feul, but how to get their planes on location in time. Göring insisted that Luftwaffe had to protect the whole of Great Germany (including areas like France), so they were scattered across the teritory in small and rather ineffective units. Some of his generals did suggest to withdraw Luftwaffe from France to the original Germany, to tighten the defence, but Göring never accepted it.