I don't understand the meaning of mediocre and always put for forth 110% ... and yes, I'm worth more than 5%.... anytime anywhere.
I admire your self-confidence but (with apologies for being off-topic) I never understood the math of someone claiming to give more than 100% - it is not possible unless you "steal" from other areas of your life. What are you prepared to short-change? your health, family, social life? Also, before long your employer will come to expect it as normal.