A 97 200HP OCEAN PRO will burn 15-18 GPH at a 4000 RPM cruise. Make sure your propped right, and there are no dings in it. Also make sure the carbs are clean and the floats are set right. And total timing is pretty important for max economy, as well as the link and sync. The total timing should be 17-19 at 5000 RPM's(I like 18-18 1/2 on mine), and 20 can cause some issues with overheating and piston galling.
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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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