Just a reminder for residents of British Columbia:
You are entitled to a refund of your ICBC car insurance premium for the entire period your vehicle is out of Canada/USA....i.e. in Mexico. You just have to apply for the refund at any ICBC office, providing documentation to show the dates you entered and exited Mexico. I always ask Mexican Immigration to stamp my passport for both entry and exit, as well as keeping a copy of the receipt you get from Mexican Customs for the vehicle when you leave Mexico, which shows entry and exit dates.
In my case, the refund for the 6 months we spend in Mexico more than covers the cost of the Mexican car insurance policy.