MPG chart.

[tsubaki]

The actuality of it is, how it always was.
The faster you can go while consuming the least amount of fuel, the farther you can go.

The gph gauge was very important to me since I have only 2/20 gallon saddle tanks.
If I was fishing offshore and I was pressed for time to get back without running out of fuel I could calculate my available range by the gph/mph chart.

Our dock is 15 miles from the sound and around here we need to run another 6 miles to the first offshore reef which is in only 30' of water.
The next nearest reef is 10 miles offshore but it's in only 40' of water.
To get into some decent fish we need to be about 25 miles offshore and at that it's only 55' deep.

So you figure if I was wanting to fish 25 miles offshore and if I was able to maintain 30mph at 11.06gph (2.71mpg) I could go 108 miles on 40 gallons of fuel. The actual trip would be 80 miles and consume 30 gallons of fuel.

See why I was so worried about the fuel consumption?

[BillTex]

Oh yes...i do understand. For those of us that fish offshore range (- gph) is critical!

I was wondering if you have had the chance to prove your extrapolations.

And what was your baseline?

Thanks, Bill

[SkunkBoat]

so MPH divided by GPH= the values in Miles per Gallon

IF you are travelling 1 mph @ 1gph you will travel 1 mile using 1 gallon in one hour

The chart doesn't do anything for you if you don't already know you gph rate at any given mph.

If you know your gph at a given speed you can use the chart to calculate range at a given speed.(if you accurately know how much gas you have)

If you accurately know your gph, you probably have a electronics telling you your range.

[tsubaki]

Originally Posted by SkunkBoat

so MPH divided by GPH= the values in Miles per Gallon

IF you are travelling 1 mph @ 1gph you will travel 1 mile using 1 gallon in one hour

The chart doesn't do anything for you if you don't already know you gph rate at any given mph.

If you know your gph at a given speed you can use the chart to calculate range at a given speed.(if you accurately know how much gas you have)

If you accurately know your gph, you probably have a electronics telling you your range.

Exactly!
I was lucky enough to be within a gallon of my actual fuel level as to what the gauge said.
Having the gph fuel consumption device and something like a gps for mph was the only way to get close. Doing the math does the rest.

[tsubaki]

Originally Posted by BillTex

Oh yes...i do understand. For those of us that fish offshore range (- gph) is critical!

I was wondering if you have had the chance to prove your extrapolations.

And what was your baseline?

Thanks, Bill

There was no baseline, SkunkBoat pretty much covered it in post #8.
The chart is for at a glance as to your current mileage based on knowing your fuel consumption and speed.
Go back to my post #5, click on the link and see the pictures of my dash.
The device in the bottom center of pictures 5-7 is a Lowrance fuel flow device, the top right is a depth finder/gps. By knowing your speed and fuel consumption, math can do the rest.

[BillTex]

Originally Posted by tsubaki

There was no baseline, SkunkBoat pretty much covered it in post #8.
The chart is for at a glance as to your current mileage based on knowing your fuel consumption and speed.
Go back to my post #5, click on the link and see the pictures of my dash.
The device in the bottom center of pictures 5-7 is a Lowrance fuel flow device, the top right is a depth finder/gps. By knowing your speed and fuel consumption, math can do the rest.

OK...missed the part about the flow meter...that's what i was looking for!
Thanks, this is good info.

So the flowscan shows ~3900 rpm is the most efficient cruise speed.
When u get over 4k efficiency drops off.
Speed/rpm/efficiency is not linear!
Makes the math a little tricky.

Tx, Bill

[phatdaddy]

I have never had any flow meter info until i got this new motor. It's included in the smart guage. It really lets u fine tune speed vs fuel consumption. Pretty accurate too. When i fill up i am usually within 2-3 gallons on a 45 gallon fill up. I wish i had trim tabs to even tweak it a little more.

[THEFERMANATOR]

Originally Posted by tsubaki

The actuality of it is, how it always was.
The faster you can go while consuming the least amount of fuel, the farther you can go.

The gph gauge was very important to me since I have only 2/20 gallon saddle tanks.
If I was fishing offshore and I was pressed for time to get back without running out of fuel I could calculate my available range by the gph/mph chart.

Our dock is 15 miles from the sound and around here we need to run another 6 miles to the first offshore reef which is in only 30' of water.
The next nearest reef is 10 miles offshore but it's in only 40' of water.
To get into some decent fish we need to be about 25 miles offshore and at that it's only 55' deep.

So you figure if I was wanting to fish 25 miles offshore and if I was able to maintain 30mph at 11.06gph (2.71mpg) I could go 108 miles on 40 gallons of fuel. The actual trip would be 80 miles and consume 30 gallons of fuel.

See why I was so worried about the fuel consumption?

Just wished we had water that deep at those distances. 20 miles gets you 25 feet of depth, 40 miles gets you mid 50-55 feet deep. Gotta head out around 65+ to get around 100 feet.

[SkunkBoat]

Originally Posted by THEFERMANATOR

Just wished we had water that deep at those distances. 20 miles gets you 25 feet of depth, 40 miles gets you mid 50-55 feet deep. Gotta head out around 65+ to get around 100 feet.

take a road trip to Pompano Beach. 15 miles>1000ft ... Boat a sword on a V20

[jvitiel]

So I was thinking - If high salinity increases buoyancy, does that improve fuel economy?...