If an Israeli unit leaves an EZoC to a non-EZoC hex, can it later re-enter an EZoC, or can it only move that when moving EZoC to EZoc?
The rule is a bit ambiguous on this, and in the movement example where the unit uses 3.5 MP, I'm wondering if it could use its 4th MP to head up the road into the Syrian EZoC.
Yes is may. The rule requires units to stop when they enter an EZOC. There is no mention on not being able to leaves an EZOC and then later in the move reenter a different one.