Hello Jay,
I typically fly at PEAK and 23BTDC
9000DA WOT and 2400RPM is 175KTAS +/-3kts at 9.5gph
Every 2000’ is +/-0.5gph. In other words, 11,000DA is 175KTS at 9gph and 7,000DA is 10gph.
50LOP is about a gph saved, but about 5-7 kts slower.
100ROP is about 2.5gph more and about 5-7kts faster.
The 50LOP speed loss can be reduced a bit at 28BTDC.
flying at 7500 wot 2400 rpm and 50 LOP I'm getting about 11 gal per hour and 150 TAS. Seems like once I go to WOT the fuel flow stays around 11 mph. I haven't been above 12500.