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Merc 115 four stroke
2.6 Idle
4000= 33.9
5000= 41.8
5500 or WOT= 43.5 GPS
prop is Quick Silver 13 1/8 X 16p
these readings are with two and gear plus a cooler strapped down upfront alond with a full tank and double checked with a handheld GPS along with the water speed gauge. The numbers seem to be on the high side for a 115 but that is what the readings say. I have to be careful when playing with the trim to be able to achieve max mph and I have found 4000 and 31 to 33.9 the best for fuel consumption. This past weekend on Lake Powell I did a small 90 mile round trip on a little over a 1/2 tank.
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