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 itīs a guzzler but as I said the gas i way more expensive here in Sweden and Iīm 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.

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 itīs 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....