(Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Position

[trendsetter240]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

So what's your average GPH? Are you counting running time only or any time you're in the boat?

Please explain how any of that information is useful to anybody?

I think GPH is more useful for people doing watersports. At that point you should probably be more concerned with how much time you have left for skiing/tubing rather than distance travelled.

For my purposes MPG is key as I often travel 30+ miles in a fishing trip. I need to know that the fuel in my tank will get me home safely!

 

[Home Cookin']

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

the reason seasoned boaters seem to "beat around the bush" is because your basic question is flawed. It's like asking, "how much heating oil did you use last winter?" without defining winter, factoring in location, house sizes, comfort range, etc.
Every time I use my boat, it's a different type of trip. Nothing is constant. So there are no averages, means or medians that tell us anything relevant.
One thing that I think is true about boats, but I am willing to be corrected, is that there is much wider swing on "efficiency" with speed/rpm than with cars--it seems more geometric than arithmetric. I base this (and my consumption) on the charts published by the manufacturer for my boat. Look at this and you will see what we all mean by relevant data:

http://www.yamaha-motor.com/assets/...otb_2StrokePerf_HPMidPort_150hp_058-SHB-A.pdf

I just go by this chart, haven't tested the actuals. Way too many variables. And too hard to judge actual consumption from filling back up; I use jerry cans. I'd want to run a constant speed for at least 2 hours to test it. I'll just go with the experts and not sweat it.

 

[trendsetter240]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

the reason seasoned boaters seem to "beat around the bush" is because your basic question is flawed. It's like asking, "how much heating oil did you use last winter?" without defining winter, factoring in location, house sizes, comfort range, etc.
Every time I use my boat, it's a different type of trip. Nothing is constant. So there are no averages, means or medians that tell us anything relevant.
One thing that I think is true about boats, but I am willing to be corrected, is that there is much wider swing on "efficiency" with speed/rpm than with cars--it seems more geometric than arithmetric. I base this (and my consumption) on the charts published by the manufacturer for my boat. Look at this and you will see what we all mean by relevant data:

http://www.yamaha-motor.com/assets/...otb_2StrokePerf_HPMidPort_150hp_058-SHB-A.pdf

I just go by this chart, haven't tested the actuals. Way too many variables. And too hard to judge actual consumption from filling back up; I use jerry cans. I'd want to run a constant speed for at least 2 hours to test it. I'll just go with the experts and not sweat it.

I use a GPS which tracks the total distance I travel (and running time) each trip. I fill up before I leave each time and that plus the GPS data shows me the AVG fuel consumption in MPG.

It's actually very usefull. I know appx. how far I can travel on a given amount of fuel. Granted the avg does change when conditions change drastically but by keeping track of my MPG I know what to expect.

I know to expect 5-7 MPG from my boat for an average days fishing. I also know how far I can safely go on 12 gallons. Why is this not useful?

 

[Unforcefull Force]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

the reason seasoned boaters seem to "beat around the bush" is because your basic question is flawed. It's like asking, "how much heating oil did you use last winter?" without defining winter, factoring in location, house sizes, comfort range, etc.
Every time I use my boat, it's a different type of trip. Nothing is constant. So there are no averages, means or medians that tell us anything relevant.
One thing that I think is true about boats, but I am willing to be corrected, is that there is much wider swing on "efficiency" with speed/rpm than with cars--it seems more geometric than arithmetric. I base this (and my consumption) on the charts published by the manufacturer for my boat. Look at this and you will see what we all mean by relevant data:

http://www.yamaha-motor.com/assets/...otb_2StrokePerf_HPMidPort_150hp_058-SHB-A.pdf

I just go by this chart, haven't tested the actuals. Way too many variables. And too hard to judge actual consumption from filling back up; I use jerry cans. I'd want to run a constant speed for at least 2 hours to test it. I'll just go with the experts and not sweat it.

So basically what you are saying is, you don't know. I understand now.

My post was not "How much gas do you use in one day on your boat"?

It asked to list some BASIC operating facts and some results. IF you list other variables which you feel are necessary, than even better!

There are many different kinds of boats. I figured maybe one day someone might be able to look at this and say ?hey, that boat and motor is similar to mine, I should expect to see AROUND XXX usage if I use my boat this or that way".

I would like to hear from the end-user's real life experiences.

I find it really hard to believe that any experienced boater can not accurately respond to this thread.

-Mark

 

[Unforcefull Force]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

1969 Slickcraft SS170V, 17ft 1100lbs dry.

1995 Evinrude 70HP 2-stroke.

15p SS Solas HR Titan 4 -blade prop.

WOT Speed 35mph @ 7GPH = 5mpg.

I average about 7mpg when fishing (combo of WOT, Cruise, Trolling).

Perfect example!

Thanks!!

-Mark

 

[dbkerley]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

I'm going back to my gauge on this one. How many have noticed that it isn't marked in the same manner as an automotive gauge? Maybe some of the newer boats gauges are IDK. Anyway, mine is marked at 1/4, 1/3, 1/2, 2/3, and full. These marking follow the old adage of 1/3 out, 1/3 in, and 1/3 for drift.

I have no idea what my mileage is because there are no fuel stops along the way. I have to know where I'm going, what the winds and weather are doing and how fast do I need to get there. Then I can go to the charts for my specific fuel burn and guesstimate the total number of gallons I'll need plus 1/3.

 

[Snobike Mike]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

According to boattest my boat gets around 4.6 mpg at cruise and 1/2 that at WOT.

Not sure what my actual mileage is but I seem to be averaging 3.6 gph for all hours the engine runs which includes idling, no wake, cruise, WOT, etc.

 

[Silvertip]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

Lets make some small talk about MPG and GPH just for giggles. Lets assume ones boat gets 3 MPG. You determined this by any number of ways, none of them very accurate since the boat doesn't have an odometer. But it is miles traveled divided by gallons used. If it has a paddle wheel pickup for a fish finder that at least gives you a semblance of distance. So you really can't calculate MPG unless you know exactly how far you traveled on exactly how much fuel. So at best, your fuel consumption calculation is less than perfect. Now lets assume you also know that on a longer trip one should figure 1/3 of the fuel load out, 1/3 of the fuel load back, and 1/3 of the fuel load for reserve. So one can also deduce that if one had a 33 gallon tank that 11 gallons of that load would take you 33 miles. Another 1/3 gets you back those 11 miles and you would have 11 gallons in reserve. No problems -- right??

Let's now make use of the same boat but it now has a fuel flow monitor and no other electronics except a tach and speedometer, just like the above boat. Since a fuel flow monitor can display instant fuel flow in GPH as well as average, as well as fuel remaining, fuel used since last reset to name just a few, after just a couple of trips you will know precisely what the fuel flow rate is at nearly any RPM, speed and load.

So now lets take a trip. In the first example on the way back you realize the boat must be using way more gas than expected since the fuel gauge is dropping like a rock. You begin looking for a marina. Had this boat been fitted with a fuel flow monitor you would have realized about 1/8 mile from the dock that something was amiss because flow rate would be drastically different than what you normally saw. Where a fuel flow monitor is available it does not take a rocket scientist to determine how far one can go. The monitor tells you fuel remaining. It also tells you flow rate at the current throttle setting. 7 gph with 33 gallons available provides over 4 hours of run time at that throttle setting. What ever the speedometer says at that throttle setting multiplied by 4 is the distance you can run. That gives you the option to take an alternate course if necessary

So you see, knowing what the MPG is of your boat is valuable. But it is valuable ONLY if you can count on the boat consistently delivering 3 MPG. Not just at the load and speed you did your testing to see what MPG is, but at various loads as well. Flow rate is used in aviation as well as is #/hr. Now then, if you can see the shoreline from anywhere on the body of water you are on it really is a moot point. Run out of gas you can paddle or swim to shore.

 

[Unforcefull Force]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

Lets assume ones boat gets 3 MPG.
But it is miles traveled divided by gallons used.
So you really can't calculate MPG unless you know exactly how far you traveled on exactly how much fuel.

Exactly, Me personally, I know how many miles it is (from starting point A to end point B) to get to where I am going. (I filled up before I left, filled up when I returned) gallons on the pump divided by distance traveled) I also know the max my boat will ever use (WOT USAGE). If at any given time I throttle down : I get better milage. If I always plan for 2.5 MPG, which is my worst case scenario, and I have a 30 gallon tank, then I know how many miles I can travel. Now, this does NOT mean to live on the edge. It is easy, for me, to make an educated guess, based on the milage I've gone, to "play it safe" and re-fill within Approximately 10 miles left. I have done it this way for years and I have never run out of gas.


I always know where I am going though. I can see your point if you are referring to anyone who goes out for hours, cruises around all day and don't know how far they have traveled. This is not my case. Even when I don't know the exact distance I am going, I use my GPS to make an educated guess as to the distance I have traveled. It is NOT that difficult for me to do so, if it was I would probably purchase a fuel monitoring system.

Anyways, so what you are trying to say is you have a fuel flow monitoring system. Are you going to share the information about your fuel consumption, since you are able to produce an actual accurate answer for your boat?

I get what you are trying to say, you are not for MPG; You feel as though it is an inaccurate reading on the water, and it can be if done incorrectly. However, no one ever said that you were wrong, but you took it upon yourself to create this long debate for no reason, when you can correctly reply to the post by saying: I have a fuel monitoring system. My boat is a XXX. My engine is XXX. When I am on the water for XXX I get XXX. This information is an estimate and it was windy that day.

That's all I was asking and I'm sorry for posting back a little aggressively. I just feel like this thread is turing into an ATTACK thread and it doesn't have to be.


TO ALL:

I wasn't trying to create a long thread about which reading is better. Just a thread about real people and real gas consumption. I am thinking about creating 10 more threads about everything people are posting on here not pertaining to the simple fuel consumption question. If you don't want to answer, why post? People are debating and there is no debate! How much gas do you use? simple. " I use 30 gallons in 10 hours @ WOT, windy, 25' boat, 19xx" or the same response with MPG, if you know the specifics. Fill in a few blanks, a few x-factors, give any details you may have.

I am not a mean person, pretty fun actually. I have 0 intensions to aggravate people. I was just looking for facts.

Sorry,

-Mark

 

[paulrfrancisco]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

1990 30' Cruisers twin 454 330hp 9500lbs dry weight.
Cruise at 3200-3300 rpms @ approx 27-29mph
GPH with flow meters 18-19 per hour each motor
1.37 Gallons per mile. (120 gallons consumed for 87 miles traveled)

 

[sasto]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

9/09/10.....3.5gpm of diesel @ 2600 rpm going 24kts.....yup, gallons per mile.

 

[QC]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

..3.5gpm .yup, gallons per mile.

Better than gallons per minute

 

[dingbat]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

1997 Grady White 226, 22ft, @ 5,600 lbs with both fuel tanks filled.

1997 Evinrude 200HP Ocean Pro 2-stroke

19p SS Renegade Offshore 4 -blade prop

1000 RPM - 2.5 kts = @ 4.5 mpg

4300 RPM - 27 kts. = @ 2.4 mpg in good conditions. 1/2 that when snotty

5600 RPM - 34 kts = @ 1.9 mpg

 

['96 Charger]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

19' Charger bass boat with 200hp Yammie Pro-V. Prop is a 25p Yammie pro se

I made a trip to Greers Ferry lake back in April and made a 20 mile run each way plus a little extra. Water was a little choppy that day as well. Can't forget about the wind either. Most of the running was at 4500rpm doing about 55mph. Opened it up a couple times wrapping it up to 5300 rpm just for the fun of it. All this running calculated to just over 4mpg. Not bad for a carb 200 on a heavy hull.

 

[triumphrick]

Re: (Gas Consumption) Year * Make * Model * Engine(s)* MPG * or * HPG * Throttle Posi

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to all:

. I am thinking about creating 10 more threads about everything people are posting on here not pertaining to the simple fuel consumption question. If you don't want to answer, why post? People are debating and there is no debate!

I am not a mean person, pretty fun actually. I have 0 intensions to aggravate people. I was just looking for facts.

Sorry,

-mark

please don't