Originally Posted by
lin821
Secondly, even when, like you say, Mexico allows them to be in Mexico beyond the original 90 days
I wasn't going to reply, as it seems we're talking past each other, but the above statement is one of those I just can't leave be. Mexico allows you admission on its own terms, there is no "original 90 days" - US law has no validity south of the border.
I guess I just don't understand how your replies fit with the extending-US-visa scenario.
They don't. I'm trying, apparently futilely, to explain that Mexico won't come after you for some sort of US immigration time violation, which is as I read the statements in one of the above posts.
However, after a 30 day stay in Mexico, the clock is indeed re-set. I know many EU-nationals who are permanent residents of Mexico, and travel to the US without a visa.