Originally Posted by passedpawn
I think the only thing that might be affected is how well the hop acids are liberated from the hops.
Here, I plotted that formula from above.
I must say, seeing that graphically is a little discouraging. That indicates that I'm only getting about 80% utilization since I'm at 6000 ft. If that's the case, then I would theoretically need to increase my 60 min additions 25% to get the expected IBUs. However, my brews come out pretty good so I probably won't change my additions.
And for the record, water/wort at my house boils at ~202 F. I typically boil off 1 gallon per hour. If I kept my burner cranked, I'd probably boil off twice that amount.