You would need to use the same fuel DDD did. You also do not know which brand or type of prop DDD used to match it up. Then you have to have the same ambient temperature, altitude, barometric pressure, and humidity levels used when DDD did the engine runs too. The OP is in Cedar City Utah which sits at about 5,840 feet altitude but DDD is in <font face="Arial,Helvetica,Geneva,Swiss,SunSans-Regular">Smyrna, TN which is at about 940 feet altitude. Thus engine performance would suffer a lot at the higher altitudes. There is a significant performance loss being higher up like that.
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