Fuel Economy

Engine	HP	Idle	1000	1500	2000	2500	3000	3500	4000	4500	4800	WOT
MerCruiser 3.0 MPI/TKS – 181 cid	135 hp	0.5	1	1.5	2.9	3.8	4.8	6.2	7.4	9.3	10.5	10.5 GPH
MerCruiser 4.3 TKS – 262 cid	190 hp	0.6	1.1	2.5	3.9	5	6.1	7.5	10.5	14.5	16	16.0 GPH
MerCruiser 4.3 MPI – 262 cid	220 hp	0.6	1.2	2.5	4	4.5	6	8.5	12	16	18	18.0 GPH
MerCruiser 4.5 MPI – V6	250 hp	0.7	1.3	2.2	4	5.9	6.6	8.1	10.1	14.6	19.7	19.7 GPH
MerCruiser 5.0 TKS – 305 cid	220 hp	0.8	1.5	2.8	4.9	6.6	8.1	9.4	11.5	16.3	18.2	18.2 GPH
MerCruiser 5.0 MPI – 305 cid	260 hp	0.9	1.4	2.5	4.5	6	7.9	10	12.5	16	18.5	18.5 GPH
MerCruiser 5.7 L – 350 cid	260 hp	1	1.4	2.5	4.5	6.6	8.7	9.8	12.5	17.2	21	21.0 GPH
MerCruiser 5.7 MAG – 350 cid	300 hp	1	1.5	2.5	4.5	6	7.5	10	12.5	16.5	23	23.0 GPH
MerCruiser 6.2 MAG – 377 cid	320 hp	1.1	2	3	4.5	7	9	11.5	14	18	24.5	24.5 GPH
MerCruiser 7.4 MPI – 454 cid	310 hp	1.3	2.5	3.5	6.1	9.9	12.5	17.4	22	28.5		28.5 GPH
MerCruiser 8.1 MAG – 496 cid	375 hp	1.2	2.3	3.5	5.5	8	11.5	15	20.5	27.5	30.5	30.5 GPH
MerCruiser 8.1 HO – 496 cid	425 hp	1.2	2.6	4.5	6	8	11.5	16	21.5	28.5	33.5	33.5 GPH
MerCruiser 8.2 MAG – 502 cid	380 hp	1.2	2.3	4	7	8.5	11	14.5	19.5	27	31	31.0 GPH
MerCruiser 8.2 HO – 502 cid	430 hp	1.2	2.5	4	7.5	9.5	12.5	17	21.5	29	37.5	37.5 GPH

*These figures don’t take drag of the boat, sea conditions, propeller pitch/size, or efficiency losses through transmissions and bearings into account.

WOT = Wide Open Throttle