Are you not ignoring one-half of the "12 Months or 10,000 Miles" proposition in this? You'll hit the 12 month milestone no matter what the mileage is.We just cancelled our prepaid service plan (within 30 days so 100% was refunded) The GX is my wifes car and she barely does 5k miles a year. The plan would have expired before we hit any of the major milestones and should be cheaper paying for the services out of pocket.
There's a lot of ways to say it, in my case it goes back to a lifetime of work in heavy industry and it summarizes as: If you don't pick the date and time for maintenance then the equipment will pick it for you.