Merkava.

[Imp]

It is quite intresting actually if you look at a Merk side profile the turret is not that far back compared to a standard layout. This begs the question where is the fuel thats a very compact engine bay if a reasonable amount is stored forward. My thinking is wherever they have put the rest of the fuel has created the rear storage space.
Very quick unsubstantiated look capacity is between Leo 2 + Chally, Abrams obviously needs to carry a lot more.