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I definitely see your same lower efficiency due to low temps; if it's 35 deg outside when I leave for work, I'll struggle to see 4.4 mi/kw on the gauge (that's with zero heat turned on, no seat heaters, etc). the capacity readings on those days will be in the 17.2 kwh range. when it's 80 deg outside, the same exact drive will be 5.5+ mi/kw and the battery capacity calc will be roughly 17.9 kwh.