Come on fellas a lighty shouldn't be over 10,000 feet without oxygen for the Pilot and once over FL140 oxygen for the punters too.
I was merely pointing out that providing a power chart for what looks like an IO-360 at FL120 and saying that you could not run it 'oversquare' at this altitude is a little pointless.
And yes I'm hearing you about them dreaded thermals especially over red country having spent many hours there myself. If you have a bottle with you and your machine is capable at those altitudes then it's a big sky and we are all welcome!