"Chris" wrote in message
...
I know I've come across articles that mention on a cool day
you can go over the max. gross weight by a percentage, I think 20% was
thrown out there but not sure.

You should NEVER go over max GW.. that is a limit, not a buffer zone.

The aircraft may be able to support the extra weight on a smooth day.. but
not in turbulence, and when the accident investigation computes your actual
GW and finds a "causal factor in the accident is exceeding the Max GW
allowed".. your insurance company may find your policy invalid.

BT