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I have a 1991 guardian 19 that will need repowering soon. It has a 1999 Evinrude 150 Ocean Pro. I like to cruise 27-30mph. It seems many members have the DF140 Suzuki, and are happy. Could you tell me the cost of install, and the fuel use at 3 mph trolling, and cruise at 30 mph. Also did anybody go from a 150 2 stroke to the DF140? My engine has been reliable, with $500-700 repairs a year, but am approaching 2000 hrs, of salt water use, and don't know how much longer she will last.