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i use about 500-700mb a month i am on wifi at work all day and at home the data consumption only occurs when travelling.

i am a moderate user of data when not on wifi not because im worried about the usage but more so making sure my battery wont die.
 
I use around 5-6 GBs a month because I'm always on Netflix, iHeartRadio, TuneInRadio Pro and fetch 4 email accounts hourly. If I didn't have my Unlimited plan, I'd be screwed.
 
Usage

I average 2.5 gb I hate limits , I get like 1 tb a month , I use 3G non stop and tether but I'm on 3 network in UK
 
I average about 200MB for normal use. However, I tend to stream some stuff from time to time - this will cost me well over 1GB a month.
 
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