Lol, lets just say I exceeded that greatly on the 2013 and had no issues with cels or dtcs.....SHOdded said:+/- 5% is considered the max in the best of conditions, need be concerned only when they exceed 10%. Per bank, stft + ltft should be under 20% max.
There is a good section on this in the obd troubleshooting guides you linked to yesterday.
Something else everybody needs to check out on the 2015 guide, they added a section on the dreaded MEGAKNOCK!