No grief, fair question. I am not involved at club level - but my speculative opinion is there is probably a combination of reasons why. And remember - it's a "guide"

The temp gauge on my IQ800 was the worst thing that ever happened to me - obsessed with looking at it. I am back to just the dummy light and that's fine - if I see it flash or come on - I pull over - otherwise I'm riding. That said, I can also feel/tell when she's getting warm - feet and ass get a little toastier  

Something to be said for old school gauges. Never worried about the small stuff.   That being said mine doesn't run hotter on a long lake run

Talked to a dealer.  He said perfectly normal to run anywhere from mid 60’s to mid 90’s.  All within design parameters.  Might put some tape over the digital read out so I stop worrying about it.  lol.

Circling back on this.  Do the guys with the turbos find you get higher temps when lake running hard?  Was out yesterday.  Ran in the 70’s temp wise all day.  But the big run up the lake (running 120 km/h breaking trail in a foot of new snow) it got warmer.  Just debating whether I have a weak thermostat or a weak coolant pump.  Do you see higher temps when you open these sleds up for a lake run?