My brother and I made a very similar road trip (Skiing holiday to Austria ~ 1000 km.)
I drove a 'normal' car and he drove a tesla Model 3. He left an hour earlier and arrived 30 minutes after me (with a relatively full battery to avoid the need of destination charging). He has the car for a little over a year so he probably optimized the charging schedule a bit better, but I still wonder why there was such a big difference between his and your experience (1.5 extra hours vs 4 extra hours for a single trip). He did not have to wait at the chargers, so that could account for some of it..
We only stopped for gas, toilet breaks, and took a 15 minute break for coffee and lunch.
I drove a 'normal' car and he drove a tesla Model 3. He left an hour earlier and arrived 30 minutes after me (with a relatively full battery to avoid the need of destination charging). He has the car for a little over a year so he probably optimized the charging schedule a bit better, but I still wonder why there was such a big difference between his and your experience (1.5 extra hours vs 4 extra hours for a single trip). He did not have to wait at the chargers, so that could account for some of it..
We only stopped for gas, toilet breaks, and took a 15 minute break for coffee and lunch.