McDonald’s does regional distribution that affects some of these factors too; different suppliers, etc.

It’s harder to see these days, but where I live in Albany, NY, McDonalds was in the New England region, and we would get the lobster roll “a New England favorite!”

Head a few miles away and you’d be in an area supplied out of New Jersey, Pennsylvania or Western NY. This sort of thing is noticeable if you live in a place that’s sort of a Venn diagram from a distribution standpoint.