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I've got the iPhone 6 and the watch is absolutely eating up my battery. It sometimes goes down in 2-3% chunks at a time. Anyone else seeing their phone battery decreased hugely?

This isn't happening because of the watch. Look elsewhere.
 
Thanks!
My iPhone 6 was running out of battery after around 8 hours since getting my Apple Watch.
Checked battery usage for the phone and sure enough, it was Runtastic Pro. It has accounted for 69% of my battery usage recently!!!!
I have deleted it from my Watch and will see what happens.
I have also logged the issue with Runtastic

UPDATE: Yesterday was the first day with Runtastic deleted - iPhone 6 was at 75% at the end of the day, Watch was at 50%.
Definitely the culprit in my case...
 
A few apps changed themselves to start using location services when I started using the watch. I disabled them and don't feel a change anymore. I'm sure it's slightly less but not major.
 
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