Will a job that is 11x17 autoduplexed print faster with face-up or face-down output?
Output face/up vs down should make no difference on a duplex (2-sided) print job as you described. The page needs to be flipped to print on the 2nd side either way. Choosing normal or reverse order simply changes which side gets imaged first. This is true whether it's face-up or face-down, normal or reverse order. Simplex (single sided) print jobs will output slightly faster when delivered face-up though.