And why do you think Imine are not?! I have test driven both cars over a period of time and I can def tell you there is at least 10% and if you push it 20% difference. Actually, your statement regarding the range is wrong. How do you calculate the range? Based on what the GOM is telling you?! This is not a precise method of measurement, because if the battery is not properly balanced GOM will give you irrelevant data. The only way to properly measure the difference is to drive both cars at the same conditions, not similar, and drive them down to at least 5%. Or at least look at the consumption during the trip.
And no, the 20" P is NOT more efficient or having more range than AWD 19 and that is a basic, physical fact. And yes, if you hammer the P, the difference will be in the 30%, but will never go below 10%. You can also put the P in chill mode and it drives like an AWD. The same goes for the AWD, if you hammer it and drive the P in chill, the P will go further.
Let me also guess about your neighbor, he has the all season tires surely. If you have proper winter tires with a high profile(new) you will have no issues. Yes, once the tires go down to about 5-6mm then the grip will be worse, but for 90% of the case you will be fine.
But if you really live in a hilly snowy place, sure, AWD is a better choice. But if you plan to take 1 ski trip during the winter, save the money and buy better winter tires with the savings from electricity and the 5000$ price difference.
1 more motor to break and less range albeit not that much compared to RWD,plus the 5000$ added.
Besides that, the rear motor on the AWD is less powerful than the RWD by 30hp. Which means that once you get off the start, the RWD is more powerful, as the AWD basically uses the rear motor most of the time?