Earlier quoted context omitted.
I find its all WiFi. On an xps 13 with ubuntu, I get 10-12 hours on low brightness without wifi, but often 4-6 otherwise with wifi. Its really nice for roadtrips.
Turning off wifi is probably just turning off your ability to do a lot of heavy processing as you interact with the internet, right?
But this is something Apple does right. My wife noticed that she can get around 50% more battery life out of her Macbook using Safari instead of Firefox. (7-8 hours instead of 4-5).