Upgrading to premium processing before sending rfe response?

This is a good question to ask the immigration attorney who is being paid to represent you.

How long does it take for an i-485 to be denied after the i-601 waiver is denied?

You just asked about this another post, in another way. It is highly recommended you visit with a Board Certified immigration attorney rather than...

What do i do??

You need to see a Board Certified immigration attorney immediately. There is no way to discuss this case without much more information.

Does filing an H1B extension through my employer automatically extend my I94 date?

Your question is very confusing since the only reason to file an extension is to extend your status/I-94 date. Perhaps you could discuss this with...

Looking for options to stay/work in US as L1A visa getting expired with EB1-I140 approved.

This assumes you still have a job offer. I suggest you speak the immigration attorney who is being paid to represent you.

The green card is not proof of physical presence but entries in his passport might be used.

Applying for Citizenship?

Your absences will not impact your naturalization eligibility. You can file up to three months in advance of the third anniversary assuming you...

Shouldn't you discuss this with the attorney you are paying to represent you, especially since that attorney will have to do it?

Can I travel to Mexico from india with an expired US visa and get stamping done in Mexico?

There is no advantage in going to Mexico. I would pick a US consulate that is not very busy like...maybe Iceland or Greenland.

These are excellent questions for the attorney being paid to represent you.