Inboard Diesel Jackshafted Vs. Twins on a Seamark

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The boat has a closed cooling system (fresh water cooled), so all I have had to do is run pink antifreeze thru the intake, change the zinc anodes, the oil, filters and wash the air filter. Less than 200 bucks per year. I have a floscan on the boat so I know the fuel burn numbers are right (plus I check it on fill ups before resetting). Speed is by GPS (Furuno Navnet). I repowered another boat I own 3 years ago with a 5.7l bravo1 set up for about 15k. It burned about 10 to 12 gph at cruise (25mph). Haven't used it but a couple of times since I got the TWM with the Yanmar.