getting more fuel in the tank?

[sinto607276]

Think sinto607276 is suggesting a hole drilled at top of filler tube (higher the better) freeing the possible air trap  and thus allowing more fuel. 
2 thoughts on this
1. I imagine you'd then have to block the overflow pipes
2. What's the gain, a few extra miles before having to remove your helmet.  Whoo  :rolleyes

better to carry a jerry can

Yes midden, that is my thoughts and eventually found it on old site!
Was posted by 'gnasher' but can't seem to paste it here :-(