Problems with yamaha ef2000is generator

I kept digging for more information on this and finally came up with this info. For every 1000 foot elevation gain you loose between 3 and 3.5 percent power on any generator. Makes a big difference on what I do in my trailer while camped at elevation. So I will get by for about 4 months out of the year on not using anything that requires a power ramp up on the generator. More like traditional camping. Changing the jet turns out to be not needed after finding this out. I just blew $87.00 on that change out. Then another $87.00 to change it back. What a lesson I am learning.