Personally, I rarely use 4G. Why? Because I'm a working stiff. I'm at my office for 8-10 hours a day, and the company has wifi. That wifi is very easy on my battery and it's faster (especially upstream) than any 4G in this country. At home, my wifi on Fios is even faster.
So, the time in between work and home is my commute. My phone is in my pocket when I drive, so I really don't need ANY data connection. That's why my 3G is off.
Now, the only time I might need data is if I'm out and about on the weekends. And even then, if I were to use data, it would be to check my email or casually browse the internet. Neither of these tasks require a super fast connection like 4G.
If, some day, I had to transfer a big movie from my home PC to my phone, and I was out and about, then I would consider turning on 4G to speed up that transfer. But that use case is so infrequent.
Therefore, when someone says that a phone's battery sucks when on 4G, I say, "so what?"
The good thing about science is that it's true whether or not you believe in it. -Neil deGrasse Tyson
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