Yes it can hit 6g's+ with tanks and air to air weapons loadout, but pilots try not to do that as you overstress the airframe which cuts back on the life exectancy of the plane. Fully loaded out there is a computer G limiter which limits it to no more then 3.5g. If they get into a furball the first thing they do is jettison all external tanks and air to ground ordinance.
The main advantage the F22 has in a turning fight is its vectored thrust engines which can angle up and down along the vertical axis, which definatly can help improve its turn radius and rate, and also helps it get nose on for a weapons launch more easily.
As for enemies who could deny the US air control in a war, none of the countries the US is likely to attack can. Of course the US does like to start fights with 2nd-3rd world countries where the US has both technological and numerical superiority, and also far better trained pilots. But the US certainly isnt forgetting the possibility of conflict with an enemy that does have a proper airforce and continues to develope new anti air weapons and equipment.
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