I wouldn't say I'm loyal to a particular fast food chain. There are chains I like more than others but I do like variety so I change it up. Convenience also factors in where I go. If it's close by work or home, I might go there more.

The study from Foursquare’s latest QSR Loyalty Index (QSR stands for quick-service restaurants) figured out which fast food chains we're the most loyal to by basing it on how often people go there and the number of people that do.

  1. Starbucks (fast food chain?)
  2. McDonald's
  3. Dunkin' Donuts
  4. Sonic
  5. Subway (surprisingly high)
  6. Chick-fil-A (surprisingly low)
  7. Dairy Queen (new to the top 10)
  8. Whataburger
  9. Tim Hortons
  10. Domino's (new to the list)

(BroBible)