Fluids loose volume


I was wondering if the latest fluids sim has a problem with volume conservation.
I created a litte cube fluid emitter as geometry and a domain with two collision objects. Simulation runs fine and looks nice but after some deeper investigation I think that the end fluid volume is way bigger than the start.

If you look at the side waterline it is higher than the complete fluid block in the beginning even though the fluid block was smaller than the domain - I would expect a lower water level at the bottom of the domain.

Or am I missing something?

Pictures and *.blend file attached


TankSplash.blend (592.5 KB)