That would only make sense if one is watching video. An app that is a 50 MB download is using 50 MB no matter what your speed is. It's not magically getting larger.
Agree, and that is most of the difference. A little bit of YouTube or other video here and there adds up plus it will be higher resolution in most cases.. The other parts are buffering ahead more on video or music you may not then fully watch or listen. Also web pages load faster, so you may have higher page views per unit time. most of us are not downloading files but consuming media.
You you can prove the difference by turning off LTE and seeing data use drop!
Well as far as I know I can turn mobile data off not LTE. If I do that I'm using wi-fi which is even faster. Yeah I see the pint is pages load faster so you see more ages thus more data being used. And that would be something someone wouldn't really notice. They could be looking at 25% more pages and not even think they are doing anything different then wonder why they used more data.
The Youtube app does have a setting where videos only stream in HD when on wi-fi. And Netflix has a setting where it will only stream on wi-fi. That;s good so that way if you are watching something and your wi-fi goes out you're not accidentally using mobile data.
At least on Verizon iPhones there is a switch in cellular settings to turn LTE off. I've used this personally and with many others to prove this point on higher data use with LTE.
Not sure if you use Facebook...but I noticed (and not right away) that if you don't turn off AutoPlay in the Facebook settings, then those videos posted by others can really start to dig into your data usage. Just something else to consider...