Mpg 29 Outlaw?
 

what is the mpg at cruise speed on a 29 OL with 2x454 vs 2x496 vs singel engine?

About .5mpg with twins at cruise. If your concerned about gas in a performance boat it's prolly not what your looking for.

Sounds very low. I actually checked my 322 equiped with 502's using the trip meter on my GPS 5 people on board, full coolers and a load of gear I got just over 1.5 mpg.... But Irish is right if you got to ask or worry about mpg with a performance boat you need to rethink your boat choice.

Well I'm considering cruise at 40mph....Hell when I was running 80 I bet I wasn't get .1mpg :lolhit:

Mpg??
 

I have a 24 with a blower motor pushing 700 hp, never even considered trying to figure out gas mileage. Just fill it up on the way out and fill it up on the way in !! I do have to say my 28 cobalt with a 496 gets great gas mileage and I will try to calculate that one of these days.

Thanks. I know it´s not like driving a Prius but I will by a 29 OL and want to gett the best engine setup for high mpg at cruise because I´m from Sweden and the gas costs like 3 times as much here.

I´m thinking a large singel engine with a charger. The boat is 1200 lb lighter with a single.

Or what do you think, am I wrong?

Sorry bout the spelling...

Boattest.com on my Baja 272 had best cruise around 30mph and 2.7mpg. Twins are gonna be around 1.5mpg at best cruise.
The difference between 454's and 496's would be insignificant. They're both big blocks.

Boats in general aren't known for fuel economy unless it's a sailboat. LOL


mb.

I get about 2.5 mpg in my 29OL with a single 454 mag mpi. And to answer the question... "what's it cost to fill that boat". The answer is: "does it matter?"

You forgot it depends how empty it is.:angry-smiley-038:

I think the only difference you'll honestly see from a twin to a single would be the ride of the boat...A 29OL rides better with a single from what I'm told than a twin and probably is a bit more fuel efficient, but honestly to cruise 40 with a single would most likely use more fuel cause it's 1/2 the HP

Isn't the ride better with twins?

All I know is I put over 700 hours on my 2000 w Twins and now it has over 850! With VERY few problems. 385hp mags.
Now how much Gas that was? WHO cares it was the Fun and you cant put a price on that.
If you have to worry stick w a ski boat.

What if I go with a single 700 hp engine instead of 2x350 hp?
I dont want the boat to be to heavy in the back.

I know it´s a guzzler but as I said the gas i way more expensive here in Sweden and I´m gonna some lond distans trips with the boat so as good mpg as possible is to prefer.

With all things being equal the 700hp single vs 350hp twins, the single would get better fuel economy. imho

But all things are never equal. The 700hp single will turn a much bigger prop and that's like putting monster truck tires on your pickup. The mpg goes in the toilet at all speeds It just takes a ton of power to turn that big prop at any speed.

Like everyone is saying, fuel economy is not what the boat is about.:drink:

I always liked singles
 

With twins it costs twice as much to keep up, My engine is out of the boat now being worked on and the cost is ok but two motors would double everything. If you do not have the time to fix yourself I would consider a single for that reason alone.

I disagree with this statement. I've never known anyone who has moved up to twins say "I want to go back to a single". Regular maintence (oil, filters, anitfreeze, etc) is not that much. Twins are easier to drive, usually ride better (depending on the application). And you can limp home if something bad does happen. Teo is in a unique situation in Sweeden, but I would recommend twins in a 29+ boat all day long.

Although my problem is I want to go bigger, but don't want to buy a bigger truck.

It would depend on how much power the single produces. Boattest.com has lots of fuel burn data you might find useful.

The fact is that a performance boat is more fuel efficient than other boats of similar length and power. Mainly this is because they go faster with similar power settings.

If you compare a 33 Outlaw with twin 425hp engines and a Cobalt 323 day cruiser with twin 375hp engines, the Outlaw is more than 28% more fuel efficient. Boat test had the Outlaw, at 3,000rpm burning 25gph at 42.9mph, netting 1.71mpg. The Cobalt at 3,000 rpm was burning less fuel (22.7gph) but only going 26.3mph and netting 1.33mpg. That's a significant difference for two boats that are almost exactly the same length.

A 600hp Merc racing engine burns almost 19gph at 3,000rpm and 26.6gph at 3,500rpm (as tested in a 36 Outlaw). This would seem to indicate that you'd get slightly better fuel economy with a high power single, but not as good as tbird gets with his single with stock power. At 3000rpm I get better than 3mpg with my 425hp 26 Outlaw, but it's a smaller, lighter boat than the 29.

Bottom line is how fast you want to go and how much you're willing to spend on fuel to get there. Depending on wave conditions where you boat it may not be how fast your boat will go but how fast the seas will let you go.

Thank you. Regarding to Boattest.com the single engine 278 wich is just a bit lighter than se single engine 29 OL (5.100 vs 5.575) does 2.97 mpg at cruise while the 30 OL does 1.65 mpg with it´s 6.900 lbs and 2 engines.
That makes me think a 496 HO would be the best choise. Maby with a mildly set charger.

The single is going to work more that Twice as hard to push the 29.
My 29 had 150 gal tank. could burn up in a day or a weekend YOU pick how hard to run. Go twins you wont be sorry.
If you want single go 27.

In my personal experience, I burned far more gas in a single than I do with my twin. I was always pushing the single engine harder to acheive speed. Where as I get that speed at lower RPM's with the twins.

It is possible if you were to strickly run at cruize, that the single may be better on fuel. The thing is you will burn much more at take off and at higher speeds because you are working that engine harder. Let's face it, I don't know many people that can stay just at cruize. Most start pushing that throttle forward once the speed changes you....

Dave you know me and i just cruise... at 5200RPM's:lolhit:

Cruise...? Don't you mean take flight :lolhit:

"That makes me think a 496 HO would be the best choise. Maby with a mildly set charger."

I have never seen a mildly set charger, that's a year old.
:lolhit: "Speed changes you"

Get the twins. i have the single. :drink:

Who and the hell would worry about how much
fuel you would use when it comes to boating, if
fuel is a problem do not buy a boat .
Twins are the way to go, if you have 496 s do not
build them, they ll last for ever just service them well.
I have 740 hrs and no problems.

I know the mpg will vanish as soon as I start playing around and thats fine with me. The thing is that there is an island I probably will go to lots of times and it is about 170 miles away from shore and that is the only thing thats makes me think about the mpg at cruise.
Or that and the fact that the singel engine 29 is about 5.600 lbs and the dubble 6.800 lbs.

Thats why I say, that I don't think the single would be better on fuel. Look with those numbers a single is pushing 5600 lbs the dual is pushing 3400 lbs per engine. Common sense would say the twins are going to be better on fuel. If anything I think a twin small block would probably be the very best on fuel.

Certainly you are going to burn fuel faster with the twins, but you are going to go faster as well. I know i go farther on the same fuel with my twin engines than I did with my single.

Not only would I think it's better on fuel, but being 170 miles from shore on a single wouldn't make me feel very secure.

170 miles from shore in a 29' anything wouldn't make me secure no matter how it was powered. :eek:

I´ve done that journey in a smaller boat. The waters are pritty calm over here.

You do have a point there..