Can my I-94 be extended on re-entry to the US on a B1/B2 Visa?

[monipom]

I have 1 year B2 visa but my duration was set to 6 months by border control but I want to extend my stay for another 6 months so I can finish my journey.

I will fly to Europe and Israel during my stay. My questions are:

When I leave the US for my this trip, is my I-94 (departure date) reset?
When I come back and will I be issued a new I-94?
If I am re-issued a new exit date, is there a chance it will be longer than the previous one?
If I'm lucky and they let me re-enter, will I be issued a new I-94 with a new exit date?
If I apply for an extension now, will the extension be valid after I return from Europe?

I would appreciate some anecdotes about not being able to re-enter, I have heard that it may be hard to re-enter but I've not heard any actual stories of it happening.

Thank you!

[immihelp]

1. When I leave the US for my this trip, is my I-94 (departure date) reset?

Yes

2. When I come back and will I be issued a new I-94?
Yes

3. If I am re-issued a new exit date, is there a chance it will be longer than the previous one?
No longer than 6 months.

4. If I'm lucky and they let me re-enter, will I be issued a new I-94 with a new exit date?
Yes

5.
If I apply for an extension now, will the extension be valid after I return from Europe?
Your extension application will be void when you exit the US.