260 wh/km is very high. You drive a similar speed on a model 3 with aero wheels you’ll probably average 240 - 250 watts per MILE.. so 160 wh/km.
Well, this is not surprising. The two cars are different in drag coefficient (iPace 0.29 vs M3 0.23), weight (iPace 2130kg vs M3 1800kg) and wheel size (iPace 245/50R20 vs M3 235/40ZR19).
Note also that the 260Wh/km I mentioned was with the heating on (outside temperature, as far as I remember, was about 6-7 deg C).
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