Dec 16th 2012, 16:15:26
Repeating from another thread, you lose minimum readiness if you do not send more than (roughly) 38% of your standing army in your attack.
Example, if you have 70k troops, 100k jets and 20k tanks, that is (70/2 + 100 + 20*2) = 175k jets worth of attack power. So if you attack with 66k or less jets (~38% of that), you will lose minimum readiness (7%) per attack.
You regain back 3% per turn used in the attack, so for non-tyranny/demo which uses 2 turns to attack, you gain back 6% for an overall loss of 1%.