I believe highways will give you more miles since there's less acceleration. I'm almost always city driving in Lakewood which is mostly "stop and go traffic" and acceleration to catch the turning signals.
There is a mileage by speed chart you can find on reddit, this is disproven. 35 mph or so is the ideal best mileage speed. Most all of the acceleration used comes back via regeneration. It's simply wind resistance that proves to be the difference. On the highway, the energy screen will typically show you 2.5-3.5, maybe 4. On city roads, it's easy to hit 6-7 in decent weather.
The 400 was one time ever, I think I had no highway that "tank". Generally, I top out at around 300, except in winter or summer. Also, note this is a 2020 which has 10% larger battery capacity. 300 is < 5 mi/kWH.
