I dont think in ww2 planes who ran out of fuel went looking for a nice level place to land. most pilots would rather bail out than crash land. and even if they landed undamaged, they would ran away as far away from plane as they could.
just pay attention to your fuel level, if you run out then either ditch or bail, other than that would be gamey. this has been asked many times. It really sucks sometimes to not see your name in lights, specially if you had some really awesome fite with somebody.
semp