I always like to use fresh gas from a local Hess station 2 miles up the road from me before a ride. I live a couple miles from the Manheim Auto Auction so they gas up THOUSANDS of cars on top of the local traffic EACH WEEK!
I know that stuff is fresh. I run 92 Octane there or is it 93 :?: lol
I wouldnt go higher than 94 unless my engine required it.
Ya know something else,as much riding as I used to do,even racing.... I never ONCE gapped a plug!!! I dont know why,just never did... I am going to make an effort to do so each plug I change periodically too on my new toy. I was also reading that antifreeze wears out!! I only thought after a LOT of use not regularly like engine oil!! I always changed my oil after every hard ride or every other ride normally,but never antifreeze. Another thing I will start to have to do. I am very picky about oil changing!!
I never had one engine have a problem,only rebuilt tops ends on my 2 strokes to keep em fresh. I can just say I think 20hrs is a LOOOOOONG time to break in a Z..... I mean if you ride it easy and slow for that long then you hammer on it anyways its still not going to be used to the high RPM's... I just will take it easy, go through all the ears for about 20min to wear in the tranny,change the oil, ride again for about 30min slowly too,let it cool. Ride again for 30 min reving a bit higher. Change the oil again.
Ride for an hour or so at a decent but not screaming pace. Let it cool Ride another hour varying RPM's only keeping them high for a few seconds.Then change the oil again. "expensive process"
Then it should be ready to go.

And right before I get ready to hammer it gap and install a new plug,clean the filter again,and flush and fill the cooling system. Anyone else think this is bad to do??? I know valves and stuff have to wear in but that seems like a looooong time to me anyways. Thanks for the advice and bearing with my twist in topics... lol
I tend to get off on rabbit trails sometimes.