Turning efficiency on its head

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Today I travelled to Canberra.  The trip was made early morning with little traffic on the road.  I was able to sit on cruise control without any major variations in speed.
In an ICE vehicle this would’ve resulted in far greater fuel efficiency than around town driving - in some vehicles this can be a greater than a 50% saving.
In analysing the data for this trip, I was surprised to find that the efficiency of the EV sitting at a constant speed on the freeway, was actually around 8% worse than around town driving.

We have done 18,390km in the Model Y for an average of 147 watts per km. This has primarily been short, slow runs around town.
For the freeway trip of 207km in light traffic the average increased to 160 watts per km - and I even took the roof rack and bike racks off for this trip!
I view this trend as a positive as the vast majority of people would do the majority of their driving around town.