Peter Dohm wrote:



3000 feet density altitude fits with 75% power in the POHs that I recall
reading for trainers with fixed pitch props.

75% is available to about 8000 feet, depends on temp.



OTOH, high power levels are available to a higher density altitude with a
controllable prop--consult the POH.

Yes, indeed, consult the POH. The prop is irrelavant to the discussion
unless you've installed one hell of a cruise prop that just won't turn up.