That study done in July by Prof Viviana Rojas, for the University of San Antonio is now complete. It is 26 pages, but I had to boost the resolution

It surveys/polls American residents in Chapala, Mazatlan and Puerto Vallarta. I don't know if there is anything earth shattering - people are moving for 'lifestyle' reasons - better lifestyle on a fixed income. I don't know if this necessarily applies to Canadians, who have re-access to 'cradle to grave' free health care if needed (after typically a three month wait).
Anyways - I didn't study it in depth. I was quite surprised the amount people said they were living on was quite low, lower than I expected.
http://www.allacademic.com//meta/p_mla_apa_research_citation/0/1/9/8/7/pages19873/p19873-1.php