Some Warrior questions

[playingtokrush]

Base:
- 5% miss 2H (hitting for damage 92% of the time after dodge/parry)
- 20% miss dual wield (hitting for damage 77% of the time after dodge/parry)
- 2H DPS = 0.92 * (58+60) = 108.56 DPS
- Dual DPS = 0.77 * ((40+60) + 0.5*(40+60)) =  115.5 DPS
- Advantage - dual by 6.4% (offset by better instants with 2H)

Where do you get your 20% miss rate for dual wield value? I'm fairly sure Blizzard has stated that dual wield has either a 25% base miss rate or 25% increase to base miss rate (which would end up at 30%, so I doubt that's the case).