That could be it. The wind even from the rzck reduced mileageIt could be because of two things. We have quite a bit of wind here in Kansas and it can blow opposite your direction. Second the roads are empty and there almost no use of the regen braking.
It is not the car as the Prius is about 40-42 only most of the time, same route.
Also the RAV is relatively new; it may break in a bit.l over time.