My 2019 M3P stayed at 302-308 of an estimated 310 range for the first 20+k miles. Now at 40k miles, the reading is 281-286 miles. Close to a 10% range loss, or is it? The truth is I see no difference on my commute. I drive a 300-mile round trip once a week. Most of those 40K miles are the same interstate drive. It does take an extra 10 % coming home versus going to work. 1500 ft elevation gain going home but also fighting the prevailing winds. Truth is I arrive home or at work with approximately the same remaining "miles" as I always did. This matters because driving home, leaving with 100% charge, 80 mph, wind and cold, as low as -20 F, I get home with < 5% charge. What I'm saying is in my 40k mile observation I haven't seen any difference in actual range going from an estimated 308 to 280 miles. The new FSD-beta with interstate NOA driving does seem more energy efficient than prior NOA, although this observation has only been for 3 months.