A 15 pitch prop in the MIRAGE line may be a better choice as that 99 150 will have the 1.86:1 lower unit in it. Expect WOT speeds around 40-43 like Reel said, but fuel burn numbers on that engine should be around 12GPH at 3800-4000 RPM's and 18-19 GPH at WOT if it is like my 95 150 EFI I had.
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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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