Even between wifi at home and work, streaming Spotify while driving and miscellaneous app usage off wifi gets me to basically 4GB a month. I can keep downloading more songs since I'm on Premium, but I think even with that I still actively have to watch my data usage and make a conscious effort to conserve data. I dunno, it's just nuts to try to do anything online without breaking your data cap in the world of 1080p and high quality audio streams