I call bullocks. I've consistently used the same amount of data (3-4 GB a month) on my 6+ as I have with my iPhone 5 (4, 3G, and 2G as well). I can't be in the minority on this one either.
Why can't you be in the minority?
FWIW, I definitely use more data on my 6+ than I did on my previous iPhone 5.