Thomas Borchert writes:

David,

Quite right. That one surprised me as well.


Why?

Note the original statement:

Specifically, you should not be leaning if your engine in making 75%
power or better.

There may be planes where it's not OK to lean at 75%, but all of the
POH's I've looked at so far *require* leaning at 75% power to get the
performance numbers (fuel burn and range) that they list.


All the best,


David