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I did a couple of spreadsheets looking at how % of increase in body and pack weight might affect distance if they were inversely proportional. 10% more tot wt. = 10% less miles.
It didn't seem to be enough reduction in miles for me.
So I ran a scenario where 10% more PACK wt. = 10% reduction in miles.
That gave me half the distance if I increased pack from 18 to 36 lbs. (of course). So there seems to be more variables involved and I can't do calculus with more than two variables because I have an UL brain.
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Jim M