a month back I had it lose 50% for 100 miles. In good warm summer conditions you might get 300, in worst conditions 200.
Another way to think about it is time. I did an 8 hour trip each way, starting at 90-100% I'd drive around 3 hours before first stop being needed, then 2 hours for any subsequent stops. I was losing around 25% an hour at motorway speeds, in winter this might be 30%. You'd rarely plan to stop below 20%, and when on the road there's substantial diminishing returns for charging beyond 60-70% (it gets slower as it gets nearer to full charge)