MacBook Pro Retina 15-inch battery life on Yosemite

Has anyone noticed impact on the battery after upgrading to Yosemite? I found only one article online that talks about the impact. I followed the instructions but still the battery life did not improve. I'm running MacBook Pro Retina Late 2013, 15-inch, 2.6GHz Core i-7, 16GB RAM.
I think that I should be getting more than 8h of life when fully charged.
Link to article on iMore.com: http://www.imore.com/how-resolve-battery-life-troubles-your-retina-macbook-pro

So here is an update: I've followed the article posted by OGELTHORPE (Thank you!). What I actually did is 1. Reset the SMC and 2. Reset the PRAM (MacBook Air SMC and PRAM reset).
What I've seen so far: Once I did the reset, I would guess that the system needed to re-calcualte again the battery charge. Initially after I disconnected from power, it started with a measurement from under 3:30h. After 45 minutes running on battery it is showing again 8:45h remaining  @ 93% charge. What I noticed is that every time I put the laptop to sleep this repeats - starting with some low time measurement and slowly climbing. I think that this could be a bug in the software and the battery charge calculation method is somehow not working properly. I wonder after those resets if the OS needs to get into a couple of battery charge cycles and the battery is calibrated again?
I don't recall having this issue with the last year's release of Mavericks.
I hope someone from Apple sees this and address this with the next OS X update.

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