Don, I‘m basically with you.
However, for me there‘s also one damn good reason to look at the range left: Because it‘s there, and always right glancing back at me! So I can‘t help but recognize that number. This is simply how my brain works.
I do 18km commuting trips a lot, so for me factor 1.2 works better cause of the many accelerations and delays to city limits or city highway limits (50/100kmph).
Guess I‘m not the only person seeing it that way; just compare the thread where people are complaining about the range left being completely off after upgrading to SW Ver042 on their Ribelles. That would annoy me as well…
Since most of my rides are uphill and then down hill, such as between here and my other house, the "range left" indication is as useless as it can get. It's much worse for those who start out downhill. You go to the bottom of the hill, and it could say you have 150 miles / km left. Turn around and ride ten miles and it can l say you have five miles/km left.
SOC won't be 100% accurate in the hills either, but will be MUCH closer than "range left".
BTW, "range left" will be very accurate if the conditions do not change. But reality is we usually don't stay in the same conditions for long. We may even have to go back home to where we started! If one way was downhill with the wind, the 250 miles range left could soon change to 10 miles when you make the u-turn after driving only a few miles. It recalculates your range every ten miles /16 km for your current conditions, ignoring all other facts.
Battery SOC is a lot more accurate and dependable. We can figure out ourselves that the battery will drain a bit faster uphill than downhill.
If I could turn off the "range left", I would. Zeros can have it display something else that is more useful than "range left" IIRC.
-Don- Reno, NV