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Carom: the 6 liters per hour is not my guess, but what is reported on the Mercury gauge.
In knots, I troll at about +/- 4.5 knots per hour. Everything obviously is more or less, much depending on sea conditions, wind, currents and so on, but, again I read 6 liters per hour.
On the other way, I like to keep my tank full, so I refuel very often and, while I never take note of the liters, I well remember the Euros I spend!