Not that this is a new point by any means, I just figured I'd put it out there again. Average size is totally subjective when you're consulting a person for the answer. If the person is used to someone who is 7.5x6 let's say, then a well above-average cock of 6.5x5.5 is going to seem small. At the same time, if the person is used to guys in the low-average range, then that same 'small' cock would seem huge I'd think.
But then again...stats don't lie.