So why keep pushing the Red Box list for NA Lycomings? Pure cookbook, and misleading. Actual dyno data demonstrates percent power is a poor metric for detonation control:
The red box is far more than just a detonation control issue, but I assumed you understood that.
It is not pure cookbook at all. Cookbook would be "Run at 23/2300 and at 10.5GPH" That is a recipe that someone might follow blindly. The APS graphs are far from this.
As for being very conservative on a NA Lyc or CMI, this is true of a conforming engine, however, CHT and ICP are the things that will affect engine life, and sure Lyc's go well past TBO if looked after, and as most RV builders are keen to save a penny, over the long run, if you run your Lycoming, as per the graphs, you will save fuel, you will have good speed and range and you will have lower stress on your engine components.
Its that damned simple.
Your posts are not doing anything to help the under educated, you are more than capable of making your own operating decisions, but many here need some good education, and then let them work it out for themselves. If you had any real respect for George and co, you might actually support their education campaign. And by the way, George has not made a cracker out of me, not even via APS seminars, his generous assistance and hospitality has far exceeded the couple of dollars he may have collected as a result of my fees. I owe him.
In fact, it will not be too far down the track when we will all owe him big time for getting G100UL to the pump. But that is another story.