#2
It's so high that there's a 99% chance that your range isn't half that. By saying you have that range, you are saying that you could comfortably sing a Baritone piece, for instance, Falcon In The Dive from The Scarlet Pimpernel, then go on to sing Gethsemane from Jesus Christ Superstar all in full voice before topping it off with a respectable Mezzo Soprano Aria. I highly doubt you have that range and it's usable.
#3
Wikipedia says that Freddie Mercury range bass low F (F2) to soprano high F (F6). Although in the musical notated example it says high Bb. Just letting you know.
#4
There's some truth there. Even basses can hit C6 with the right training. But the fact that he squeaked a few notes on a live to make an impression don't really add much to the usable range. In fact, most men sound like chipmunks above let's say G5. This is just how the male voice works, not the individual's skill. If we talk about actual full voice, something that you would hear even in classical music, even the E5 is pretty rare. But, sure if you come up with some artistic application for these sounds use them.
#5
I can hit D5 but it sounds like shit. C#5 is much easier for some reason. This is falsetto BTW.
Gear:
Dean RC7X (Bareknuckle Coldsweat pickups)
Ibanez Rg2570Z (Bareknuckle Juggernaughts)
Schecter KM-6
Schecter Hellraiser Hybrid 7 String
Engl Powerball II
Orange PPC412
Line 6 Pod HD500X