However, I've already found the best club sandwiches and best roast-beef subs to order, so in the name of research, I got tuna at Jimmy John's, Jersey Mike's, and Subway to see which popular chain ...

Almost nothing fell out, which is some sort of sandwich engineering marvel ... I'll stick to the Clubby. Subway's 6-inch tuna sub was the cheapest of the bunch, but it was also by far the smallest.

Getting a sandwich at Subway may seem simple, but plenty of people are doing it wrong when ordering their handheld meal. Check out these tips.