Monte Carlo MCY70 fuel consumption

You are trying to make a boat designed for a different purpose, suit a purpose that it was never intended to fill. It's a motoryacht designed for near shore (under 250NM) usage running from one port to another. It is not designed as a bluewater ocean crossing vessel. Yes you could bring bladders, we do it on yachts and SF all of the time for long passages. But, why do you need a 2500-3000KM, that is a huge range for the type of boat and size you're looking at. Quite honestly, if you ultimately need that kind of range you're going to have to look at trawlers, expedition yachts, sailboats, or motoryachts that are a bit larger.

I think the first thing is to better understand your requirements. From what I'm reading you want to be able to cover 3000 miles but you want Euro-Styling? Is that correct? Do you require a top speed of 15 knots or 12 knots or more or less? What size range would you consider?

I certaintly wouldn't take a typical planing motoryacht of 70' on most of those trips, they're not designed for it or capable. You are not doing a transatlantic on a motoryacht of that size. Over 100' some of them yeah. Shipping it is a big option, but not on it's own bottom. Otherwise around 70' or so, you're looking at expedition yachts, period (or sail/trawler).

First, I wouldn't personally cross an ocean in a 35' sailboat although plenty of people do. But there is a big difference in what is possible to cross in versus what we might advise to do so.

Second, you're missing two basic limitations of the Monte Carlo. The hull isn't designed for ocean crossing and fuel capacity. Now the hull would probably be fine in the vast majority of conditions. Just not that 5%. And probably could still be done, just not very enjoyable. On the other hand, fuel capacity is something one can't get beyond and the added fuel required is too much for bladders to make a decent option.

There are 40'+ powerboats capable. Boats like a KK 42 for instance or a 52' Nordhavn. A Diesel Duck. 55' Fleming. 55' Bering. These are all displacement vessels with relatively small engines and large fuel capacity. But they don't have the styling you are looking for. Why? That styling doesn't always fit stylishly on top of a displacement hull plus it's less practical when space is a key requirement. Out of that group, the only one capable of the speeds you want is a Fleming and they come from 55' to 78'. 2500 nm at 10 knots but top speeds of 15 knots to 20 knots depending on engine choice.

The MCY 70 fits in a group of boats designed for Med cruising, hopping from port to port, sitting a lot. Toss Ferretti, Sunseeker, Princess, Azimut into that group. All capable of more speed but not the distance. All stylish.

Now Motor Yachts then generally come in two fashions, expedition and planing or semi-planing. Both tend toward larger, especially expedition yachts. A Moonen 72 is capable of crossing but limited to 11 knots. Someone mentioned Azimut Magellano. Capable of 17 knots, good range at 10 knots. They would probably say ocean worthy, but I wouldn't personally cross in one. I don't think that's what they're designed for.

Not a huge number of powerboats cross and outside the expedition types mentioned above, most would be 100' plus. For instance, Hatteras builds capable boats, but even the 100' would need bladders. Moonen builds Aluminum fast displacement. Their 105' is capable of 22 knots and 2750 nm at 11 knots. There are other aluminum boats in that size range capable.

Going to fiberglass, you also have expedition yachts, but getting into semi-planing, you're generally looking at 120'+ for the speed, range and sea worthiness. 120' OA built by Christiansen. 125' Hargrave (perhaps 114'), 130' Westport, Horizon builds boats capable of the speeds you're after but don't have the range. Then boats with the range that come up short of the speed. One thing to note too, these boats all look more like yachts than the sportier boats you're talking about in the Monte Carlo. People like Sanlorenzo and Benetti build a lot of combinations capable of crossing, some with top speeds up to 17 knots or so.

Simply a 70' Planing hull design isn't capable, so to find a 70' you sacrifice style and speed. Over 100' you can find semi-planing that are capable of doing it at 10-12 knots but capable of running faster as well.

Every boat is a compromise and one has to decide which of their requirements is most important. You started emphasizing styling. Well, to us in a 40-60' play boat, styling was very important. In a long range cruiser not so much. We wanted more speed than displacement hulls but that forced us larger than we started out in order to get the range and the ocean capabilities. Most feel we are silly wanting to cross on our own hull and suggest as Capt J did, that you get the boat you like to use and ship it across. A lot of boats shipped like that, even among those capable of crossing. After one round trip, I suspect we'll even do that, but we do want to cross once on our own.

We cheated so I wouldn't say we made "sacrifices." Instead we chose multiple boats for different purposes. And our long range boat is substantially over the size you're talking about.

Book a cruise! Also, Catamarans are another choice for the speed you're looking for and the range. Something like the Horizon 60'. But on a mono-hull in the 70' range, you're either going to have speed and short range (300NM +/-), or slow speed and lots of range, but not both. On a planing hull weight has a large effect, so carrying around 10,000lbs of extra fuel would change speed considerably and that's why they usually only carry enough fuel for a 300NM +/- range at cruise speed though.

Look at a used 76' Northern Marine. They would cruise at 12 knots and had the range to do 2500nm I think at 12 knots......tons of space both inside and out......for example

Top speed 21.8 knots. Range at 10 knots is 760 nm. It only has a 1000 gallon fuel capacity.