I manage a 7.3 Gemini with a 225 opti. the boat i sheavy and runs up to 12 passengers. with a full comliment of passengers she burns 20/22 GPH (american) which runs out to 80 to 85 LPH. This is maxed out and probably pulling 40 knots.
I think thats a very reasonable consumption for an engine thats working it's valves off. she runs about 80 litres an hour at full chat empty but then the boats is getting near to 50 knots.
On a 69 the figures would be much more reasonable and the power would be exciting
Here it comes again, I don't stand a chance
Soul possession, Got me in a trance
Pullin' me back to you - Deja Voodoo