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I would say this biggest thing that could affect you speed are the water conditions if the dealer says everything is running fine. The most we have got out of our 180 Challenger on the SeaDoo speedometer is 42mph. We have never tried it on GPS to see how accurate that was though.
Hmm, my 2008 SE shows 55mph when pushed to the walls and a full tank.
Next time I'll GPS it and see how it really does.
