Gas Usage

[smendez]

Our 2005 22v with the Tige GM Vortec 5.7l MPI (340 HP), consumes very close to 13 GPH at 30 MPH. I gasp every time I throw the hammer down.

Do the owners of similar boats with fuel flow meters see the same gas burn rates that I'm seeing?

And yes - I have checked and it's set to display U.S. Gallons instead of liters.

I have also attached a picture of the Fariah Fuel Flow meter on the dashboard.

[David Baker]

That seems high. Did you verify with refill?

[Flying Tiger]

My Sea Doo Speedster gets 4 mpg.

I think 13 mpg on a super heavy towboat is pretty good.
Friends Howard burns 250 gallons in about 2 hours.

[GIZMO]

My 20v is about 11gph at 30mph.

[smendez]

Originally posted by David Baker
That seems high. Did you verify with refill?

David:
Yes. I also continue to calibrate after every refill and try to get it closer. It is now off by less than 1 gallon after a 34+ gallon refill, but the 13gph does not go away :(

Originally posted by Flying Tiger
Friends Howard burns 250 gallons in about 2 hours.
Flying Tiger:
I'm not sure who Friends Howard is. I can only hope his boat is either a barge or is really, really fast.

[whitlock87]

I have a switch V with the Marine Power 5.7 340hp
I went out today, and we skied for 4.5 hours and only used 11 gallons of gas.
I have never checked at speeds.
I am more interested at average time usage. When I get down to 7 gallons, I know that I need to be at the doc with in the next 30 minuets

[TeamAllen]

Is that running with any ballast?

[b/w05]

I have a 2005 22i with 340 hp marine power. I average 3.5 gph each outing.... boarding, skiing, surfing & playing.

[jsz]

i have a 02 21v with a 350 merc MPI. i get about 5gph with half cruising ang half towing.

[Tequilasun]

Smendez,

That sounds pretty high. I burn about a half a tank a day.

I haven't done the formal calcs, but I about 6 gph. We don't run flat out very often though.

[smendez]

Originally posted by TeamAllen
Is that running with any ballast?

No ballast

[smendez]

Originally posted by whitlock87
I have a switch V with the Marine Power 5.7 340hp
I went out today, and we skied for 4.5 hours and only used 11 gallons of gas.
I have never checked at speeds.
I am more interested at average time usage. When I get down to 7 gallons, I know that I need to be at the doc with in the next 30 minuets

Same engine. Your boat is a little lighter (3505lbs vs. 3945), but you're saying your boat burns between 2.44 gph (11/4.5) to a possibly more realistic 5.5 gph if you were only running half the time of the 4.5 hours.
That's still a huge difference.

[smendez]

Originally posted by jilly
I have a 2005 22i with 340 hp marine power. I average 3.5 gph each outing.... boarding, skiing, surfing & playing.

Are you averaging 3.5 gph (gallons per hour) for each outing or are you saying that you're using about 3.5 gallons per outing?

Either way - that's extremely low. hmmm..

[smendez]

Originally posted by draginass
Smendez,

That sounds pretty high. I burn about a half a tank a day.

I haven't done the formal calcs, but I about 6 gph. We don't run flat out very often though.

If I went the entire day, I'd burn more than 1/2 tank. Heck, if I run WOT (wide open throttle), I'd be burning over 24 gallons per hour, or so says the gauge.

I'm really confused. I'm either blocking a reality or just don't know what to think.

Anyone else have any input?

[whitlock87]

If you only get 13gph, then after 3hours you would be empty.
I have 38-gallon tank, with a 5.7 votec 340hp
I have been out for over 12 hours on one tank.
Ye it is stop and go, and most of time I driving between 15 to 20 mph. (towing skiers and tubes)
I would go off the average usage

[balti]

22v , 340 hp, ride with full ballast and maintain rpm below 3000 and the needle hardly moved after three hours of riding.

Its a new boat though so I am unsure as to what the consumption would be when run in.

[raythompson]

The Tige gauge does not work well at all. The boat has be level, like pile everyone in front of the windshield and the look at the gauge. My gauge when it reads half full indicates that I have about 7 gallons left in the tank. And at the consumption rate of the boat, I better find fuel within the next 20 miles.

[Tequilasun]

The only thing I can think of it that there is a fuel return. That would account for the high gph. But you verified by refill, hmmm I'm thoroughly confused.

I'm gonna do a test this weekend. Fill up, run for an hour solid at say 22 mph (average) then fill up again. We'll see how that comes out.

But with the fill up, there is always a sketchy point, cause you can fill the fill tube, that might give a gallon or so variance. Sorry just thinking and typing.

[Tequilasun]

Originally posted by balti
22v , 340 hp, ride with full ballast and maintain rpm below 3000 and the needle hardly moved after three hours of riding.

Its a new boat though so I am unsure as to what the consumption would be when run in.


Balti,

You need to have a look at this thread, and don't trust your fuel gauge.

http://www.tigeowners.com/forum/showthread.php?s=&threadid=73&highlight=fuel+gauge

[smendez]

Unfortunately, I don't believe the Fariah gauge offers an average GPH reading. I'll definitely look for it, since many folks here have mentioned it (probably from their Navman units).

I'm under the impression that this boat eats a lot of gas (at least more than my 2003 22v), but it sure does not eat twice as much as the GPH reading from the gauge would lead me to believe.

It could be that the Fariah gauge may be off in it's GPH reading (not proven yet), but be correct on the reading that tells me how much gas is left in the tank.

Regardless, if this boat is truly drinking that much gas, you would think it'd be running rich enough that I should be able to tell by inspecting the spark plugs - Does anyone concur? Does anyone know if the engine computer can tell me something when properly plugged in to a diagnostic device to see if I have a problem in the boat or is it all in my head? - hint - hint - Mr. M.D.?

In a car it's really easy to measure Miles Per Gallon? What do you do in a boat?