High Power Cruise
High power cruise is generally defined as power settings between 65 and 74% of rated engine power. In this
range, TCM recommends the fuel mixture be leaned for “best power” settings (see chart on page 27). This can be
done by leaning to the values in the POH, or if EGT information is available, lean the mixture by finding peak
EGT and adjusting richer to get to best power. The leanest cylinder EGT (first to peak) should be at least 50°F
rich of peak, preferably 75°F rich of peak. Since a 75 to 100°F EGT spread is normal, a single point EGT system
should be adjusted to at least 125°F rich of peak. Multi-point EGT systems should be adjusted so the cylinder
with the leanest (first to peak) EGT is 50 to 75°F rich of peak. For turbocharged engines, TIT limitations may
restrict leaning. In those cases, comply with the AFM/POH instructions.
well, Yes, that will give the best power, but also highest cylinder pressures and CHT temps.. but as it says, it provides best power.. best power at the cost of engine longevity.