Battery seem to be better on LTE

I have iPhone 5s from Sep 2103. I was always on 3G. 5 days back I upgraded to LTE. After upgrading, I found out that the battery life seem to be better. For similar usage (music, twitter, email, facebook, browsing) I get 20% difference between LTE and 3G, LTE being better

Has anyone noticed this? I am sure this is not a placebo effect :)

I am on iOS 7.1.1