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The previous owner says he got about 70 hours of service from one tank. Going from 35 US gal tank to litres per hour I estimate 1.9L/hour. Does this sound right?
Yes, that's pretty close. I use the figure of around 1/2 gallon (US) per hour at my moderate cruising speed (no tachometer). Yanmar specifications (you do have the factory Service Manual, right?), though, actually suggest a little higher fuel consumption, around 0.7 gallons (us) per hour at full power.
 

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The rule of thumb that I've used is that you have 18 hp-hrs in a gallon of diesel.
The 2QM15 is rated at 14 horsepower, so 14/18 = 0.777 gallons per hour, which is pretty close to Yanmar's spec for the engine. Just some confirmation of your rule of thumb....
 
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