Think all the fuel talking is a little overdone. For example, flying the Dora without using MW50 (due to the engine blow bug) does not really makeca difference. When you get jumped by surprise MW50 doesn't help and when you fly disciplined it doesn't matter much also. Keep altitude and speed, fight the fights you can win, avoid the ones you may loose. Easiercsaid than done, I am working on it lol.
MW50 helps chasing running enemies down though, makes a 5 percent difference or so.