When you try convenience store coffee...

Sometimes it has a burnt smell like low-end brand coffee,
sometimes it has a taste and aroma similar to Starbucks,
and strangely, the taste can even vary depending on the store.
It is obvious that the coffee machines and beans will differ by convenience store, which naturally leads to differences in taste,
but I've heard that even within the same convenience store brand, the taste can vary from store to store.
Of course, my standard is an Iced Americano.