I disagree. Above 5000 feet, yes, boil for longer. But if you are below 2500 feet, don't waste the time of the fuel. Pretty much everything that can hurt you dies at 180F, you hit that before things boil at the altitudes most of us live at.
Special cases are just that, special. "Don't drink the water" is a special case that exists at sea. *shrugs* Keep the special cases in mind, but don't make them SOP.
_________________________
-IronRaven
When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.