What engine do you have now? I see you have 140 VRO listed, but that could be an 84 1/2 140 cross-flow gas hog. An 85+ 140 looper will actually get decent milage if it is in good tune and health. A 140 OMC looper should use roughly 8-10 GPH at a 4000 RPM cruise, and from others have posted should get you around 22-25 MPH. That would be close to 2.5-3 MPG for an old school 2 stroker.
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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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