How Much Mobile Data Do You Actually Use?

Some of us—including me—are lucky enough to still have unlimited data plans. That's great, especially given that I burned through 2.6GB in the last month alone. But just how much mobile data do you use?

My effort is a result of a heady mixture of tethered internet and Spotify listening while travelling, which clearly crunches through the data. But I can't be the biggest user by an stretch of the imagination. So, who can beat me?