I'm a little new to the 650r, my mileage seems to be about 39 mpg so far running 60 to 65
I ran a multiday 5000 mile ride on an xr4 last fall with a stock seat and I was comfortable and I just walked in from 155 miler on the 650r and it felt great as well.
Years ago I bicycle toured enough to know how important wearing the right unders are, I use and really like the troy lee 7705's. During my xr4 ride last fall I had a couple of days that were over 105 and I tried riding without them and within 50 miles I knew if I continued without them I would pay big time in the coming days, somewhat like bad blisters on a multiday walk.
They are also armored, not a lot of armor but way more than none. Now and again I get the tt540 out and ride ovals and have been off a couple of times pretty hard and I think the hip/thigh protection they offer has been useful.