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Engine RPM From %BHP and Pressure Alt

Pressure Alt: OAT °F: %BHP: Calculated RPM:          Std Temp:             Density Alt:          Calculate Done

Pressure Altitude	RPM	20°C/36°F Below Standard Temperature			Standard Temperature			20°C/36°F Above Standard Temperature
		%BHP	KTAS	GPH	%BHP	KTAS	GPH	%BHP	KTAS	GPH
2000	2550	80	114	8.8	75	113	8.2	71	113	7.8
	2500	76	111	8.3	71	111	7.8	67	111	7.5
	2400	68	107	7.5	64	107	7.2	61	106	6.9
	2300	61	102	6.9	58	101	6.7	55	99	6.5
	2200	55	96	6.4	52	95	6.2	49	93	6.1
4000	2600	80	116	8.8	75	116	8.3	71	116	7.8
	2500	72	111	7.9	68	111	7.5	64	110	7.2
	2400	65	107	7.3	61	106	6.9	58	104	6.7
	2300	58	101	6.7	55	100	6.5	53	98	6.3
	2200	52	95	6.3	49	93	6.1	47	92	5.9
6000	2650	80	118	8.8	75	118	8.2	71	118	7.8
	2600	76	116	8.3	71	116	7.9	68	115	7.5
	2500	69	111	7.6	65	110	7.2	62	109	7.0
	2400	62	106	7.0	59	104	6.7	56	103	6.5
	2300	56	100	6.5	53	98	6.3	50	97	6.1
	2200	50	94	6.1	47	92	5.9	45	91	5.8

From Cessna 172M POH Fig 5-7 Cruise Performance

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