4000 in the Abrams. I thought the Leo2 had the same.
110%. It is an emergency evacuation shelter, and mainly as a rear egress route.
It wasn’t intended as an IFV. Furthermore the space only really existed because when the IDF looked at crew losses, the majority where from engine fires - so they put the engine up front to also provide protection to the crew (rounds need to into it first) and the rear was designed to allow the crew to exit the vehicle. When they realized they had more room, it was then setup to accommodate being able to shelter a lost crew from another tank. The entire IFV aspect is a myth that has been popularized from folks not understanding the concept.