I have a question regarding the mixture setting when climbing from one altitude to another. For example, say I am flying a C172 at 3000msl and have adjusted the mixture for this altitude. When subsequently leaving the umbrella of overhead airspace, I would like to climb to 6500msl as per my flight plan. What mixture setting should I use when applying full throttle to get to the higher altitude before leaning again once I reach 6500?
Thanks a lot for your help.