I think there might be something else at play here too Bert - The engine ran fine at the "summer setting" on the ground run ups but was just slightly lean in the Air - My in flight CHT's were also low as the engine is uncowled.. I did try a few minutes of WOT and then I could dial out the additional fuel until it cooled again.. I don't think we are currently compensating for a "cooler" engine.. Had trouble getting above 120 deg and wouldn't stay there. Had the big prop on (18-6 wide) and it had lots of power.

Two things of note also: The engine ran very clean - Very little residue and was very light.

The fuel burn was incredible - I only filled the tank once and wanted to run it dry as I was using my Wife's SUV for transport. Bet I flew over 20 total minutes on 8 oz of fuel. Some putting around but lots of high power stuff too.. In the end to run dry - I set up a turn of about 700m in diameter and was trying to see how many I could do without correction - air was so smooth I had a few intervals where I counted 5 uncorrected circuits that were almost superimposed.