Why do both McDonald's and KFC begin to pay attention to the promotion of freshly ground coffee?

Food and beverage does not leave home, stay in such a busy area, on the basis of eating more, of course I hope you drink more; on the basis of what you want to eat, of course I hope you can come when you want to drink. By introducing freshly ground coffee, a more expensive drink, it can naturally increase ARPU (per capita consumption) or attract more passenger flow. McDonald's McCoffee is an old brand (since 1993)