I haven't seen any controlled tests to validate this. From what I've seen, the 980 motors are less efficient.
I did a drive against my wife's M3P and she was 20 wh/mi less efficient despite being 400 lbs less weight. Speeds were 65 mph the whole wa
I don’t break 300 wh/mi at 70mph and that’s with Uberturbines (even on mild highway inclines) The Long range Y does 280 wh/mi more or less with Geminis.