and, as everyone knows,
if you boil dinner at the top of Whitney, it occurs at only 185F so it would take less energy

is that true? ... there is less O2 pressure, so the fire burns slower and longer to get to that 185, thus has more losses on the way up, therefore does it end up actually being less efficient and burn more fuel to get to 185 than a fire to 212 at sea level?

some heat physics expert might care to speculate. otherwise.....