Hello again, back with more Electric car. Wisdom. You all remember the lying WLTP test? Well now I can Announce The Pat method. Don’t go believing any old nonsense, It is what you’ve got not the way that you do it.
Well my ID3 is given as being capable of 425 Kms WLTP. But everyone knows this is codswallop (well now they do).
Here is my infallible method (summer only for now!).
1. Take the battery size, in my case 58 kWh.
2. Take 2/3 of this number ~ 40
3. Multiply by ten 400, this is what your car can do without AC
4. But electric cars are so well built that AC is a must if you don’t want to suffocate! Reduce by 10% for AC
My car will then do 360kms which is what it actually does (WLTP and by consequence VW have cheated me out of 65kms real world).
Any variation on how you use it pales into insignificance.
Finally if you want to use the Pat method for any other car, multiply by the ratio of efficiencies found on any comparative website (The ID3 is at 166Wh/km)
A Kia Niro comes in at 173 Wh/km for instance, try it.
Just got an ID3 
Coming home from holidays achieved 223 miles with 40 miles left according to car, so range of 263 miles(420km) without air con. Vs your method of 443km for 64kw eniro. Not bad
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