Great app but drains battery on long runs

We all use the app to track our runs and its great :)
I have iPhone 6s and over six miles I noticed the battery gets pretty low. I wish it didnt really effect the battery. I even turned off all notifications and still was a drain. I love it for my 5 mile runs tho.

Sadananda about ASICS Runkeeper—Run Tracker, v6.8.1