I have a 115hp Optimax on a 6.1m Quimtrex.

I dont know what it does when zooming along but overall it averages 1nm per litre.

It has returned the same average over the life of the combo since we got it in 2004.

I am pleased with that.

Your figures look pretty good to me especially for a 175hp outfit doing around 4000 revs.

Terry

 Thanks Terry,

Your average is about what I get when conditions are nice. 1nm is 1.85 km.

Cheers.

 talking about petrol does anyone know wat the maximum amount of petrol one can carry on their boat as extra fuel? 

 With a 6 metre glass Evolution ...hull/motor/300 liters fuel/ 2 people = approx 1.8 tonne 

  Cruising speed 21knots @ 3600 RPM @ 24 LPH

 Thanks Nev, thats 1.61km/L

Anyone with a 5 m platey got some figures?

took the tinny out the other day. headed north from barri to the sandpatch (3mile) trolled then headed another mile n half north into shallows on the lumps (beach hehe) then headed up to baldface in shallows (another 5.5mile north) headed back 5mile then out west 7mile then trolled all way back to river mouth broadside to 20knt sw. use 17 litres of fuel on a tohatsu 25hp 2stroke. amazing fuel economy from a 2 stoke but have always loved tohatsu's.

 if you use your boat a lot you will notice the savings. our last boat we put in about $110 worth of fuel every trip, now its only filling up a 25 litre jerry can every month! Using the dinghy every weekend travelling about 18km i use less than 10 litres of fuel. 

 Thanks Bruce, I get out every 2 weeks, sometimes weekly, and spend around 60-70 each time (sometimes 120, sometimes 40).

I'll do some sums.

Cheers, Craig.

you will struggle to go back to an aluminium boat,worth a few extra bucks in fuel to have to

comfortable ride.my dream boat if ever i can afford one.

Im running about 1.2 - 1.4km/l

Pushing 2.5T with a 220 4/st MPI 

Regularly fish an area a measured 19nm each way plus a number of drifts of perhaps .4nm so call it 40nm in total , - the pivotal issue seems to be sea and swell which greatly impacts on consumption but best in really good conditions = 59 litres and worst in crappy conditions both ways was 91 litres but generally in average conditions 70-71 litres ( just randomly checked my receipts just to make sure on volumes ) - oddly the coowner of the boat always uses at least 10 litres more so trim of the boat is clearly critical 

Always filled until the breather gurgles fuel so the measures are accurate 

Believe the conversion is 1.852 km = a Nautical mile so a round trip of 74 kms so an average of 1km per litre

We use 70 litres to do 55 nautical miles generally cruising at 27 knots.

On our last trip to the Abrolhos, I covered 213km and used 198L of fuel.....1.07km/L. My boat was pushing a heap more gear than I needed, but being my first trip to the islands, I took too much gear (as you do on your first trip). My main tank holds approx. 170L and I had another 6 jerry cans of fuel and 2 jerry cans of water on the deck....besides my dive gear, 4 cylinders, fishing tackle, esky, food, etc. 

My last couple of trips out from Mandurah have seen me cover 75kms and use around 50L per trip....1.5km/L. Obviously pushing less gear but cruising on around 23kn and 4200 - 4400 revs, depending on outboard trim.

regards
rusty...

 Last two trips ive covered on average around 2.0km/l averaging around 24knts.

 I have a 4.8 metre plate ally with 60hp 4 stroke Yamaha on the back I did 9 days in exmouth at Christmas time and used 80 litres. This included trip to the islands, trolling from north to south passage, and the shoals inside the gulf plus a hell of a lot of running around. Used the boat every day not sure how many Km's I did though. I did do 55 mile of two rocks about a month ago and used around 30 litres. Usually cost me between $40-50 of ultimate every time I go out. 

 Seems there's plenty of opti's out there!

Great info, thanks everyone for the help. 

and on an average day i use around 1ltr per 1nm running at cruising speed 28knots, it drops to .7 if its rough or if im at full throttle 45 knots.

we've got a 6.85 cruisecraft explorer with 250hp Yamaha 4 stroke we were getting around 1.5k to the litre over the weekend, conditions were pretty good and running relatively high speeds 

 Not really relevant to your scenario, but I have a 5.2 glass cuddy with a merc 115 2 stroke.  Hilary's to rotto, burn around to a few spots.  I usually sit on 25 knots or so, and use about 40L for the day.  I have no idea how far I'm travelling in total, but my fuel economy seems reasonable for a 2 stroke..  Seriously hanging out of the day I can get a 6m with a 4 stroke though.   Sucks having to shout every time you want to talk to someone.

8m Fury console, 2.5 tonne, twin 140 Johnson 4stks... 1.7ltr per mile for both engines. So .85ltr per mile per engine or there abouts. 1 mile = 1.852kms.

Standard day out for us would be 45 mile, so i would budget 90 ltrs worst case weather, but likely to only use 76ltrs

6.7 metre ally with 225 4 stroke around 1.2 Ks to the litre on average with 2 POB, a bit better on dead calm days and obviously a bit heavier on a rough day, or with more people on board.

10 Metre Naiad, twin 300 Yammies, 47 knots and 220 litres an hour on WOT,   25 knots equals 62 litres an hour with full load of fuel --780 litres and 5 blokes.

35 Bertram twin Volvo 255 hp Turbo diesels consumption sitting on about 18 knots total of 2.08 litres per km which is about 40% better than previous petrols

I get about 2.4km/L fot about 25knot average for an normal fishing trip payload.

 I have a 610 trailly with a yammy 150 4st  most time cruising up to 25 knots 1 lt per NM above that it goes up to 1.2 To 1.3 lts per nm , all depends on sea conditions and trim on the day,  did have a 150 optimax on the same rig and was more get up and go and better economy

1990 6.3m Caribbean Reef Runner with 1998 Optimax

Using around 1L per km...  Thats based on only a few times Ive taken her out.. Cruising anywhere from 20 to 30 knots... 3000 to 3800 rpm.

But she is a heavy fibreglass hull... Carrying 200L esky full of ice and beer!!! 

Usually hauling 2 to 3 blokes averaging 90kgs each..

Still not exactly sure how big my tank is... but I think its only around 150 - 160 Liters....  Biggest downfall really... I need another 2nd fuel tank installed to increase my range!!

She is all 4mm and has a 115 suzuki 4 on the back and no matter how loaded up she is I get 2km/l.

Trim is your best friend

Also got a 3.70 proline with a 15 hp merc 2 stroke and did a trip of about 65km and used 20 litres of fuel with a full load (running with tide obviously)

6m Haines traveller 175hp Suzuki I average 0.75lt per km, and I'm usually sitting on 4500rpms doing around 25knotts

I usually head out around 30k with roughly 10 drifts and back, so say 70k (38nm) in mild swell and chop at around 4200rpm with 4 people 170l icebox with plenty of food and bevys on board, 200l of of fuel with the latest 175 Suzuki four stroke and ill fill up at the servo the next day only to put 42l back in the tank

 mine works out to be very similar to yours jng

23 foot cc glass 4 people on board sitting on 30 knots apprx 1l per km

MY little tub gives me 2km/l. Did a 40km trip over bunbury and was a tad under 20L - includes flushing the motor too. another one was 28km for 13L. So I base it on the 2km/l and all is sweet.

 Didnt want to answer this til we'd done few island runs

Twin Suzi DF115's

over 3 island trips this year between 110 and 125 nm fuel burn has been 170 litres (measured) to 220l (dipped).

difference being i think in how much trolling/cruising on on engine.

Each time loaded with 6 people (4 or 5 kids)

 2301 seaswirl striper. 225honda  513ltr standard fuel tank. No jerrys required. Hillarys to Rotto 20ltrs. Just got back from 4 days at abrolhos fully loaded adventuring every day 3 blokes 3 eskys 20 bags ice dive gear inc 6x15ltr cylinders burnt 398L. Cruise at 24kts approx 40L/hr 

 The 5.2 plate we've been using for 3 years up until recently fitted with a Yamaha F100 cruised at about 1 nautical mile per litre. I was a very heavy boat or its size! If you want to see a heap of consumption and performance data for Yamaha outboards check out www.yamaha-motor.com.au/products/marine-outboard/power-reports

Cheers,

Luke

 1 .1ltr per mile at 4000 rpm but crank it up and ouch

oil 1 ltr per 76 litres of juice 

300 ltr fuel tank 12 litre oil

670 Coraline walkaround (plate aluminium).

200 4 stroke yamaha.

average about 1.2km/l cruising around 22-25knots in a range of sea conditions.

5.2m 90 yamaha,last trip to rotto at about 3800 rpm some trolling 70 n miles used 76 litres

just headed up to the abrohlos

47" riv - Decisions

twin cat c12's 700hp a side

avg burn of 190l/hr @ 25 kts

doesnt matter if im doing 15 or 25 when theyre running they need the juice

on avg does about 7.5l/nm

8000Ltr trip freo to the islands and back but what a trip..