Fuel use-gctid340268

[capt._ron]

I just figured my fuel usage for last year, I used 5.22 gallons per hour according to my receipts & time on meter. This seems better than what I expected. What are others getting on EH700, did I forget a fill up? This was the end of our 2nd year with the boat and I never checked it the 1st. I'am trying to figure if I can make the 270 miles from Memphis to Kidd city fuel. Thank You

[mmichellich]

Gallons used per hour meter hour is not a useful measure. My 310 Hinos use about .75 gallons per hour meter hour sitting in the slip. What have I missed?

[Guest]

Yeah, our gph went way down when we moved into the lake and ran at no wake speed for about an hour on each trip . . .

[Guest]

For many years I have calculated 6-7 gal/hr doing most of my running at 5-7 knots. I do not have flo meters and calculate by gallons used and hours run. This is not 100% accurate but over many years it is consistant. I run in fresh water. Some runs are at 2600 rpms, probably 20% of the time and running both EH 700 Hinos. At what speeds do you do most on your running?

Richard

[capt._ron]

Richard I run anywhere from 1000 to 2000 rpm @ 6 to 18 mph. Half of it with the current which run 2 to 5.5 mph. The 1st year I checked it in mpg, I think I got 1.7. This year in gph that includes gen time which I thought would give me a reliable average. Planning different trips for next year trying to settle on one, going to Memphis has the longest stretch without a fuel stop. I normally run around 1800 rpm but will run at wot for a couple of minutes each trip.

[mmichellich]

capt. ron wrote:
Richard I run anywhere from 1000 to 2000 rpm @ 6 to 18 mph. Half of it with the current which run 2 to 5.5 mph. The 1st year I checked it in mpg, I think I got 1.7. This year in gph that includes gen time which I thought would give me a reliable average. Planning different trips for next year trying to settle on one, going to Memphis has the longest stretch without a fuel stop. I normally run around 1800 rpm but will run at wot for a couple of minutes each trip.

In terms of mpg, it would seem that 1800 to 2000 RPM would be about the worst RPM to run a Hino 38. Also, I do not understand 18 MPH at 2000 RPM on a 38??

[smitty477]

"I'am trying to figure if I can make the 270 miles from Memphis to Kidd city fuel. Thank You "

With engines in good shape and the bottom and running gear clean you can expect these ranges when running in nuetral seas....

3-4 nmpg running at sub 5 knot speeds (6 mph or less)

2-2.5 nmpg running at 6 knots

1.2 - 1.4 nmpg running at 14-15 knots

But ... carefull that tides,headseas, and wind could hamper those numbers greatly.

And mmichellich has a very good point that 2000 rpm's will never yield 18 mph.

Hope this helps

[Guest]

Ron,

I am in a land locked lake and there is no current. At 1800-2000 rpm I would be approaching the top most part of the wall of water before starting to get to the planing stage which for me is about 2400 rpm. I would agree with mmichellich that 1800-2000 would be worst for mileage. I don't know what effect current going with the boat would have on mileage at that rpm. How the boat is loaded and its distribution is another factor, I tend to be a little stern heavy. Smitty is more accurate on the nmpg figures at various speeds from what I have seen in the past. His observation of tides, currents, wind are definite factors. Figuring speed of 14-15 knots would roughly translates to 300+ miles on tank capacity with 10% reserve in calm water gives an idea whether the run can be made. Slower speeds up to hull speed (about 6 knots) would about double or more the distance in calm water. Bayliner advertised 1000 miles on a full tank years ago but I think that was with the original mitsubishis, lower HP. I speculate the 175 Hinos would be more in the 800-900 miles at about 5 knots although I have not seen that data on the 175s. Anyone know of that data?

As an aside I love the change that allows you to see the posts in the thread to reply.

Richard

[smitty477]

The 38 Bayliner has 304 US gallon of tankage of which about 280 gallons are usable.

I hate to take the liberty of planning fuel stops for anyione else since each person has various levels of tolerance for risk.

But say you want to have a 10% reserve on the 280 gallons - that leaves about 250 gal to burn.

At a low hull speed of 5-6 mph (not knots) you would be at least at 2.5nmpg X 250g = 500 in nuetral seas.

Of course you could do better than that as well or worse in poor seas or tides.

I think you will find that below hull speeds any 'modern' 4 stroke comparable diesel will get the 'same' mileage.

Hope this helps

[dmcb]

have a small Garmin that records miles. I leave it on all the time so I know how many miles I travel each season.

With that I can get a pretty good idea of mpg.

I do run on one engine most of the time but get over 4 mpg on our 38xx with Hino's.

While not perfect I kept the hours the same on both engines. Both were use approx. the same when running. I doubled the fuel I put in the tank not servicing the genny to get these figures.

Doug

[Guest]

Smitty,

Good point, I shouldn't suggest to anyone a fuel burn for a trip. They should calculate their fuel use, speed to run, conditions likely to encounter on the run.

I found the 1000 miles on a tank of fuel in an early 38 MY literature (mitsubisshies). If I understand your thought that any 4 cycle diesel should do about the same are you saying that the 175s would be capable of 1000 miles or is it more to the fact you are talking about possibly 500 miles on a tank with 250 gallons being burned at 5-6mph?

I haven't tried Doug's single running yet but am thinking of it this summer. My longest run would be 20+ miles.

Richard

[Machog]

Smitty, how did you determine how much useful fuel you have, is there a rule of thumb?

Spec on my 4087 is 220 gallons, split into 2 tanks. I normally fill up when I've used around 100 - 120 gallons, huge margin of safety, but would love to know how low I could run it in an emergency.

Tx Machog

[smitty477]

"If I understand your thought that any 4 cycle diesel should do about the same are you saying that the 175s would be capable of 1000 miles or is it more to the fact you are talking about possibly 500 miles on a tank with 250 gallons being burned at 5-6mph?"

Yes - If engines, bottom, and running gear are in good condition you could do 1,000 miles on one tank at 280 gal and 3.5 - 4.0 mpg. Early Bayliner adds always stated their stats in statute miles intead of nm as that looked better (5,280 vs 6,000 ft). Nuetral seas - I say that again because we can never count on that here.

Doug is you best source for what you can extract from these engines at the best hull speed as he has lived it in a big way and has great data.

FWIW - we always work in nautical miles and often need to convert to miles for this forum as many post in miles. Of course when folks want to talk abut how fast their dinghies can go we can always resort to kilometers per hour.

"Smitty, how did you determine how much useful fuel you have, is there a rule of thumb?

No rule of thumb on this one but actual measurements on my 38, 45, and 47 Bayliners. The fuel pickup is about 1" up on the tank and each inch of tank is about 10 gallons (just turns out that way on our tanks) and you have 2 tanks and we don't want to 'suck' air when the tanks are sloshing a bit (even with the anti slosh plates in there).

So add about 1/2" to be safe with sloshing and you have about 15 gals per tank for useful range. You can check yours if you pull your fuel pickups out at any time.

Not familiar with the 4087 tanks but if they are 22" (or close) from top to bottom you also have 1" = 10 gal.

Hope this helps

[capt._ron]

The 18 mph was with the current & may of been less than 2000 rpm. Getting to Memphis is not a problem it's getting back that i'am concerned about. I typically set the throttles to make 13 mph going against the current, when the river is up at the same rpm I've gained 5 mph going with it. There are enough marinas I've never worried about having enough fuel. The reason Memphis is on list is the reasonable cost of a slip. It may be moot now I read that Kidd City fuel is no longer selling fuel so that adds about more 100 miles without fuel. The reason I made the post I thought my fuel would be around 8 to 10 gph. Like Doug I keep the total miles traveled on my Garmin, never checked it at the end of the season. Thank you everyone I appreciate your replies.

[mmichellich]

capt. ron wrote:
The 18 mph was with the current & may of been less than 2000 rpm. Getting to Memphis is not a problem it's getting back that i'am concerned about. I typically set the throttles to make 13 mph going against the current, when the river is up at the same rpm I've gained 5 mph going with it. There are enough marinas I've never worried about having enough fuel. The reason Memphis is on list is the reasonable cost of a slip. It may be moot now I read that Kidd City fuel is no longer selling fuel so that adds about more 100 miles without fuel. The reason I made the post I thought my fuel would be around 8 to 10 gph. Like Doug I keep the total miles traveled on my Garmin, never checked it at the end of the season. Thank you everyone I appreciate your replies.

Lets see if I understan, you get 18 mph at 2000 rpm or less with a 5 mph pushing current, or 12 mph in zero current. Maybe you need to let the rest of the 38 owners with Hino 175s know how to do this. Something doesn't track other data including Bayliner boat test which are the most optimistic anyone has ever seen.