Some real interesting tips in that link... For instance, I wonder why: "If high humidity does exist, it would be wise to add 10% to your computed takeoff distance and anticipate a reduced climb rate."...
And that 'Koch chart' is very telling... From that, off my 2,800' elevation strip last Sunday, with 85oF temp., my t/o roll would have increased by about 50% and climb rate would have been down by 30%..
Also, Mike, thanks for your "long winded answer"; it's responses like yours that make these forums so valuable...
Cheers,
Chris