I have around 500 hrs in real life in a Bonanza you should aim for 65% power in cruise
eg 24/2200
or 23/2300
or 22/2400 which I prefer as its the most achievable at cruise levels
All are 65%
The mixture must be adjusted and a new peak found every time you change altitude by 500 ft.
TAS expect 165 - 170 kts dependant on load and altitude.
Best performance will be achieved between 8000 and 9000 ft
Fuel Flow If operated in accordance with these recommendations, at 65% power and properly leaned then a fuel flow should be 53 lt/hr if in doubt use 60 lt/hr