I don't know about that, I just got it too.
Having said that, the map seems to be smaller in game than in real life to make up for it. I can usually go without drop tanks and still make it back with fuel.
Air to ground weapons I always have more than enough, that is unless you intend to hit every single AA site, which would mean you'll probably die anyway
Air to air, being pretty unreliable can run out.. and the cannon ammunition also runs out pretty quick. Just have to play careful and only fire on a sure shot.