I see I had a typo. My fully charged to 80% is nominally 360 to 370, not 270.
Also, I recently took a road trip 130km by highway, at about 105kph in about 15C weather, so no heavy heat or a/c use. However, there was a headwind, maybe 30kph or more. I did put on the Aero hubcaps. Going out, I was using 4k for every 3k travelled, coming back it was almost exactly 1:1. We got home with 50km left , only the second time I'd seen the battery indicator turn orange.
So keep in mind, those of you on those also flat and windy Alberta and Saskatchewan plains it's not just temperature. It's also airspeed.