MPG
 

Just got back from a 45 mile cruise up the gorge, most of which was at
cruising speed, 28 mph, 3200 rpm's. Used 18 gals. which translates into
2.5 miles/gal. Does that seem right for a 25' V hull with a 5.7 liter,
Alpha Drive? (I thought it would be 1.7 or so).

-Greg

MPG
 

On Mon, 23 Jan 2006 14:11:32 -0800, "Dene" wrote:

Used 18 gals. which translates into
2.5 miles/gal. Does that seem right for a 25' V hull with a 5.7 liter,
Alpha Drive? (I thought it would be 1.7 or so).

Sounds unusually good for a 5.7 on a 25 footer. I have one on a 24
and average about 2 mpg cruising at 3400.

MPG
 

Dene wrote:
Just got back from a 45 mile cruise up the gorge, most of which was at
cruising speed, 28 mph, 3200 rpm's. Used 18 gals. which translates into
2.5 miles/gal. Does that seem right for a 25' V hull with a 5.7 liter,
Alpha Drive? (I thought it would be 1.7 or so).

-Greg

That sounds great. I only get about 4nmpg, and that's at less than 1/3
of the speed you make...(but in a slightly larger boat).

MPG
 

sounds pretty good to me, especially for a boat that size

MPG
 

of course, if you backed it down to about 3000 rpm the speed wouldn't
be much different, and the savings in fuel can be a better edge even
yet.

I've run my little Chris Craft with a 4 banger alpha 1 at 3000 and it
does rather well. at 3500 the fuel consumption goes up with little
speed change, and 4000 rpm the fuel really drops and doesn't gain
hardly much speed over the 3500.

I suppose you might say that the percentage of speed vs. consumption
really drops out of your favor the higher rpm you go.

MPG
 

"Tim" wrote in message
oups.com...
of course, if you backed it down to about 3000 rpm the speed wouldn't
be much different, and the savings in fuel can be a better edge even
yet.

I've run my little Chris Craft with a 4 banger alpha 1 at 3000 and it
does rather well. at 3500 the fuel consumption goes up with little
speed change, and 4000 rpm the fuel really drops and doesn't gain
hardly much speed over the 3500.

I suppose you might say that the percentage of speed vs. consumption
really drops out of your favor the higher rpm you go.

3000 rpms puts me below cruising speed and I start to de-plane. That's one
thing that irritates me about a mono-hull compared to the cats I'm drooling
over. With my monohull boat, I can only go 3 speeds, slow (which feels like
a one armed swimmer), cruising speed, or faster. The cat I will have
someday should allow me to go 15 mph or 30 mph without significant
differences in the ride or handling.

-Greg

MPG
 

On Tue, 24 Jan 2006 15:03:15 -0800, "Dene" wrote:

3000 rpms puts me below cruising speed and I start to de-plane.

You may be able to fix that to some extent by using trim tabs to bring
the stern up and the bow down.

MPG
 

"Wayne.B" wrote in message
...
On Tue, 24 Jan 2006 15:03:15 -0800, "Dene" wrote:

3000 rpms puts me below cruising speed and I start to de-plane.

You may be able to fix that to some extent by using trim tabs to bring
the stern up and the bow down.

I have those and it does help. But....I like going 28 mph. Probably stems
from owning a 18 ft. runabout for 20 years.

-Greg

MPG
 

On Wed, 25 Jan 2006 13:44:40 -0800, "Dene" wrote:

I like going 28 mph.

That's a different problem. :-)

MPG
 

Dene wrote:

"Wayne.B" wrote in message
...

On Tue, 24 Jan 2006 15:03:15 -0800, "Dene" wrote:


3000 rpms puts me below cruising speed and I start to de-plane.

You may be able to fix that to some extent by using trim tabs to bring
the stern up and the bow down.


I have those and it does help. But....I like going 28 mph. Probably stems
from owning a 18 ft. runabout for 20 years.

-Greg



I have trim tabs on my 21ft cuddy, Yes you can keep it on plane going
very slow. the boat can go so slow that the speed stops registering.
Also makes a big whole in the water right behind the boat. The cuddy has
high side and they help with leveling the boat out in a big cross wind
as well.

Interesting enought 28 mph is where I like to run :-) It's a nice easy
speed and one can enjoy the sights.

Capt Jack R..

MPG
 

"Dene" wrote in message
. ..

"Wayne.B" wrote in message
...
On Tue, 24 Jan 2006 15:03:15 -0800, "Dene" wrote:

3000 rpms puts me below cruising speed and I start to de-plane.

You may be able to fix that to some extent by using trim tabs to bring
the stern up and the bow down.

I have those and it does help. But....I like going 28 mph. Probably
stems
from owning a 18 ft. runabout for 20 years.

-Greg



MPG? As long as I have gas available, who cares. I only really care on
long runs. With the former engine 351W I got 1.75-2 mpg, with the new 350
MPI I have not checked yet. This on slower rivers.

MPG
 

"Calif Bill" wrote in message
ink.net...


MPG? As long as I have gas available, who cares. I only really care on
long runs.

Well....I have two concerns. Range and price. My wife about chokes when we
fill her up. Then remind her what a hotel room costs.

-Greg

MPG
 

"Dene" wrote in message
...

"Calif Bill" wrote in message
ink.net...


MPG? As long as I have gas available, who cares. I only really care on
long runs.

Well....I have two concerns. Range and price. My wife about chokes when
we
fill her up. Then remind her what a hotel room costs.

-Greg



Wife figures I could have bad habits also. Besides her dad was a sailor
racing one design on San francisco bay. 30-32' sailboats are not cheap to
run and dock either. As to fill up, I choke sometimes. I have had it
siphoned a couple of times. I think the person who did it was the watchman
at the storage yard, but since he has passed to storage yard in the sky,
does not seem to be a problem. Once added 40 gallons, when I should have
needed about 6, and another time 50. Ran out of gas one time at Oroville.
3 days of running hard, and not paying attention to the fuel guage. 67
gallons to fill it up. Just what the tank says it holds. Costs almost $60
to fill the 27 gallon tank in the 2004 Chevy diesel.