baasboat1 wrote:I have worked out that over the last year I have run the engine for 34 hours at an average cost of £11.93 per hour for a 5 litre V8 in a 22ft searay. To be fair, I dont go hurtling round skiing and spend most time at 3,000rpm pulling 28 to 30 mph which is very comfortable cruising, i do have the occasional mad half hour going fast but most of the time I just cruise, so overall £12 per hour in fuel is less than I thought it was going to be - which is a nice surprise.
Last year we averaged 3.6 gallons per hour at a cost of £18.40 per hour. Not too bad, I guess. We have the Mercruiser 5.0litre MPI V8 pushing a 24foot boat probably close to 3 tons loaded.
We always have 20 -25 minutes at 6 knots at the start and finish of the day and this can easily be 20% of the days engine hours so it is a case of mixed revs, I like to cruise at 20 - 25 knots as the boat doesn't have a tendency to drop off the plane too easily then.
Would I be right in assuming that the best fuel consumption is at maximum torqe of the engine or are there too many other factors to take account of in a boat?
I always like to drive a car at max torque, then the blue lights can't catch me.
Larson 240 Cabrio "JORIDA", Saxon Wharf.