Well the general rule is 1 GPH for roughly every 10HP for a 4 stroke/DFI, and about 1 GPH for every 9HP for a carbed 2 stroke at WOT. Some large engines are more like 1 GPH to 8HP, and when you turn them up the ratio goes down even furthur. If you figure smile per gallons it may be worth it to some, but not me. It hurt bad enough when I dropped the hammer on my 225 on my HYDRA-SPORTS. It drank back 28 GPH at WOT, but she was ported and opened a touch.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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