How can I consume less energy with caravan?

Since last update, my “car with large trailer” and “car without trailer” selections give the right km/kwh. But when I calculate the same 250km route with trailer and without trailer, the estimated battery percentage on arrival is higher for the trip with trailer. With no charging stops along the way for both trips.

How can this be? In the previous version it told me I had to stop for a charge when towing the trailer. Now all of a sudden, i can do it in one go and have more energy left than not towing?

Nor possible! Please solve asap!