nevermind, I found it
First the 2018 EPA efficiency numbers for AWD and P are highlighted in the red box... note how they are
identical even though the "max output" numbers elsewhere obviously aren't? Because max output has
nothing to do with the discussion
View attachment 490723
So despite different software- the 980 motor in both cars is the exact same efficiency.
Now here's the 2020 numbers with again a red box around the 18" P and the AWD.
And the numbers are
different
Despite the only difference in the hardware being the 980 vs 990 motor.
it's almost like those are
different parts
View attachment 490725