Lilhunter, going by AMO specifications, their 70% letoff bows are AMO 65%, but they go outside that specification and use hysterisis in order to make the letoff look higher. Mathews isn't the only one doing this stuff either.

Your question then is basically, why do they ignore their own industry standards so they can advertise a higher letoff?

Same reason every manufacturer in the business ignores industry standards and advertises IBO speed ratings instead of advertising speeds obtained by AMO specification.

The higher the numbers they can advertise, the more people will buy their stuff. Or so they hope. It's called marketing. Also known as stretching the truth in advertising.

Quite frankly, I think it's way past time archers started demanding more honesty and real truth in advertising from the manufacturers. AMO set their own industry specifications and I, for one, think they should base their performance advertising on those specs. Across the board.