Pat, my testing indicates the Allegiance is still very efficient when backing out the limb bolts! Staying at 5.0 grains per lb. I only lose 2 fps going from 70 lbs. to 63 lbs. This is much less than other bows I have tested and is another impressive thing about the binary cams!
I agree this cam system is the most efficient that I've tested too however I just thought I should point out that any bow turned down from it's peak weight, regardless of manufacture will lose some efficiency due to cam orientation, the limbs losing some of their prestress (stored energy) and they'll gain brace height as well, though it's not much it all adds up.
