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Range mode also reduces battery cooling. Presumably a warmer battery gives some more range at the expense of battery longevity. That’s the reason not to use ramge mode.
It's a resistive heating element. There isn't any "more efficiently". It's always at 100% in just converting electricity into heat. This is the same kind of effect where you are trying to fill up a bucket with water, but you claim you are doing it "more efficiently" by only having your faucet turned on halfway.
Same here, I always felt "colder" with it on. This in the Sierra Nevada mountains (Colorado, Utah, Nevada, California) and it wasn't worth. If I really felt like extending the range ...