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I going off the merc monitor gauges tells you mph mpg and gph

John I did ask dealership to go over everything and they said they think everything is fine the reason why I'm posting this is a try to find out if there's any other options I have I think I'm getting horrible fuel economy. And top end speed is not there. The motors are 150 lbs heavier between...

Chris they say 6100-6300 is the range rpm you should be in wot wich I am. At 6100 trimmed out im getting 42 mph At a cruise speed is 30 mph I am getting the 1 mile per gallon. Wot I'm at .07 gallon per mile. The performance numbers are worse with the 4 strokes than my old strokes. Not sure...

I have a 1990 sailfish 252. I just repowered with 2 mercury 200 verados. The dealer put on the mirage plus props 17 in and boat was proposing at his speeds. They changed to a 15 inch mirage solved problem. I'm only getting 42 mph trimmed out which is 5 mph slower than the old motors. I'm...