Speed Vs Revs (when fuel is 2.00 per litre!)

[grant]

At the marina where I keep the limo the price of premium fuel is 2.00 per litre. So no ore for me! Jerry cans it is.

I have been doing a bit of research into what is the optimum speed to drive at. I like to fish the south end of the bay when the weather is good, so I motor down there.

This can be a considerable cost.

So.... I have started gathering some data on what revs give me what speed. Can anybody confirm that more revs mean more fuel?

http://img125.imageshack.us/img125/5463/boatspeed8xm.png

I could only do up to 10kts as I was in the Yarra channel, I intend to do a proper run next time I am out.

have you ever considered this or am I nuts?

g./

[fishing_dave]

not nuts, but I have idea,

so you wanna cut costs, ok, you said earlier that you want to get a gym, maybe invest in set of oars,


heheheheheee

[grant]

thinking of two words and one of them rhymes with duck...

[fishing_dave]

would that word duck be the first word or second word lololol

[Dekka]

Logic would have more fuel usage with greater revs.

Apart from entering/departing channels/harbours etc I drive by revs alone. Best revs for my boat is 4200, motor trimmed to 3 and just purring. This combination gives me the best economy.

With a bit of chop and the motor trimmed down a little I can hear the motor definately working harder and the fuel economy is not as good.

[seaeagle]

ive never had the pleasure of worring bout fuel cost yet, (8hp yammy)
i havernt had the 40hp out enough to test it,20lt and theres some still left...lol

its going to be like a car id rekon... if i drive to get my kids at 110kms i use HEAPS more than when i set c/c to 98kms they are 300kms away. on a roun d trip @ 98kms id use $50 fuel, not much change from $70 if 110kms.

REVs do make a huge impact IMO.

[hillbilly]

I will be a boat owner again by September and eventhough Im paying cash for a cheap little run about but the way fuel prices are going I will have to take out a bloody loan to pay for the fuel. :x

Karren :wink:

[linchpin75]

ive never had the pleasure of worring bout fuel cost yet, (8hp yammy)
i havernt had the 40hp out enough to test it,20lt and theres some still left...lol

its going to be like a car id rekon... if i drive to get my kids at 110kms i use HEAPS more than when i set c/c to 98kms they are 300kms away. on a roun d trip @ 98kms id use $50 fuel, not much change from $70 if 110kms.

REVs do make a huge impact IMO.

Agreed. If you have trip computer have a look at the instant litres/100 when doing over 100 compared to just under 100

[grant]

My territory is the same. If do 110 or under great economy 110 -120 not bad 120+ and i need a tanker behind me.

g./

[grant]

I have bought 2 X 20ltre Jerry cans and topped up the boat at 1.40 per litre as opposed to 1.98 per litre at the marina.

Saved my self 23.00

A couple of times and I will have paid for the jerry cans and be in the blue.

Over a full tank of fuel I will save 52.00 per full tank. Thats just too much to throw away, especially if I want to go hard for snpper this year and do alot of motoring hours.

I also drove at the lowest planing speed acheivable (15-17kts) and this reduced my usuage massively.

The saga continues.

g./