Sailing in Chile requires the use of the engine. Although the Pacific can be windy, quite often the wind is quite weak, and there are often days with no usable wind at all (maybe 30 % of the time), and nothing is more frustrating than making 2 to 3 knots in light wind! On engine (in my case, a 5 HP outboard Tohatsu), one can make about 5.5 knots on flat water.
If you navigate southern channels and fjords, the tidal currents and the frequent lack of wind make the use of an engine obligatory.
So, if you are not a real masochist, be prepared to motor a lot, and to have enough gas for it!
My personal attitude is that I am not in a regatta and I do not have to prove anything to anyone, so what is valid is for me is to get from point A to point B, usually as fast as possible. This dictates my strategy for the use of the motor:
So, how does one store the fuel on such a small boat?
I do not store fuel inside the hull because of the danger and the smell, and also because I eliminated the standard venting (I believe it makes the boat not safe in terms of the possible flooding through the vents). So the only good place for storage I found was the cockpit.
The Catalina 22 has a huge cockpit which is not very adequate for high seas due to its volume (more than 300 liters). So one way to deal with the problem was to fill the cockpit space with gas tanks. The standard configuration is a 45 Liter main tank and 2 x 25 liter gas canisters. All these three tanks are stored below a board firmly attached to the cockpit and which allows to organize neatly the gas tanks and prevents them to float away in case of a capsize or sea entering the cockpit (there is also the option to tie a line so that these tanks would not float from under the board should the worst happen. They also reduce the cockpit volume by more than 100 liters!
The only downside to storing gasoline there is the fact that the center of gravity will br raised somewhat, because the cockpit floor is not very low.
The 45 liter tank has a connector for the gasoline hose, and the other gas canisters must be siphoned to the small 15 liter tank
The maximum I have taken on board were 180 liters. That extra gas (60 liters) was stored in 2 liter bottles and 10 liter canisters which were placed inside the cabin to keep an eye on possible leakage.
I have run some tests on gas consumption. At full power the Catalina 22 runs at about 5.7 knots and consumes 2.5 liters of gas per hour (for a two-cycle 5 HP engine), i.e. making some 2.3 nautical miles per liter. 5.7 knots is very close to the maximum hull speed, so that reducing the speed only slightly can dramatically increase the mileage. For instance, running at 5.0 knots (15 % less than the maximum) reduces the gas consumption by almost 40 %, i.e. the mileage increases to 3.2 miles per liter. And going 4 knots will almost double the mileage.
This is important to bear in mind in case that one would run low on gasoline. If there is no wind or current going against the boat, reducing speed will significantly increase the distance which can be travelled. And with 180 liter the range is anywhere between 300 and 600 nautical miles, depending on speed, wind, and currents.