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Old 09-09-2009
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An old thread, but what the heck...

Over the course of 8 seasons, our current 3 cylinder 27hp diesel has consistently burned about 1/3 gph during normal sailboat operations. We push it hard (2700-3000 rpm whenever we're motoring, except when docking and during warm-up/cool down).

Our previous 2 cylinder 18hp diesel burned about 1/4 gph during normal sailboat operations.

So the figures cited in the initial post do not sync with our real world experience. I know my brother's gasoline A4 has a burn rate about 2-3 times our engine. It's putting out a bit more hp (30, I think), but it's pushing a smaller boat too.
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