How we judged every chain's coffee
For this test, we visited Taco Bell, Burger King, McDonald's, Wendy's, Dunkin' Donuts, and Chick-fil-A. Starbucks and the like were left off this test because they're coffee-focused chains, rather than just fast-food establishments. Dunkin' Donuts was on the fence, but since breakfast food is their primary offering (and people love their coffee), we decided to let them compete.
Each coffee was ordered during traditional breakfast hours to ensure relative freshness and drank black, without milk and sugar. Those additives might have made the coffee more palatable, but we went without it in order to get the clearest impression of the flavors.