I did about 330km from full tank (I think. assuming that the dealer filled it up to the max) and the needle is sitting slightly below half-way point. This was with mostly stop and go traffic because I tried to stay away from constant speed highway cruise.
My guesstimate is that I'll be able to do 600 km at least with full tank.
The engine's only done 330km, so I expect it to improve as it loosens up.