-50
One set of planes don't need magically longer-lasting fuel than another...
Quite debatable.
Many fighters have a pretty short range, relatively speaking. 75%-100% fuel is probably standard for the 109's, 190's, Spit 's, Typhoon, F4U's, Ki-84, N1K2, Yak's and La's. Basically the US Pursuit fighters and A6M/Ki-43 are the only fighters that have a useful flight duration on 25-50% fuel. So most fighters already run 75 -100%.
Bombers, on the other hand, are able to run 25% fuel for every tactical mission, which is probably 70% of bomber sorties. Fuel just isn't a concern for them, they don't even have to fly at cruise speed for strat runs.
They probably still won't have to throttle back anyway. It just means taking 50% instead of 25% for these short little hops. Hell, the ones that run low alt can probably still take 25%.