Why does the nav system do this?

[phxazcraig]

2023 MYP, 2024.3.15 and FSD 12.3.4.

To test new FSD versions, I do a short loop drive from my house to a Subway store and back. 4-5 miles one way.

Here's the thing. My Nav routes me there just fine, using the 'back roads'. (Four lane urban road, but 'back road' because an Interstate runs a mile to the west, in parallel.)

OK, so I have FSD take me to Subway. I test autopark and back into a spot. Then I tell the car to route me home, and it takes the freeway!

Why doesn't the nav route me back the same way I came? Taking the freeway is about the same overall speed, but 2 miles longer.

 

[Kimmi]

Routing considering traffic information and efficiency?

 

[tsh2]

I have noticed a preference for right turns rather than left (in the UK) - leading to some slightly non-obvious routes. Maybe this is selection bias, maybe its real.