I have noticed that, but perhaps it should make a slightly more forceful push into gameplay. That way you have to think about your virtual self, and your plane. It would prevent things like diving out from a hard dogfight at 13k. It all seems so gamey at times when you could turn the whole time that you had fuel, and your performance never suffers that much, or at least even in a linear pattern
In my humble opinion, the function for fatigue should be exponential. For instance, in an equation where
y= the number of g's the pilot can sustain without a blackout (when y=0 or y<0, pilot succumbs to g forces and permanantly blacks out)
and
x= sum of the number of g's pulled in the last 5 minutes
y= -.4x^.3+6
And for all of those who wish to see it as a function:
f(x)=-.4x^.3+6