In comparison, the inboard sterndrive-equipped boat burned through only 10.6 gallons (40L) per hour.
With both boats running at 25 knots, the outboard-powered petrol boat burned 15.8 gallons (60 litres) of fuel per hour. One well-publicized test compared two comparable 9m boats, one equipped with a pair of 200hp outboards and other with twin 220 hp diesel inboards, at two speeds. However, diesel inboard sterndrive motors remain winners in this race for fuel efficiency.
The sophisticated four-stroke outboard engines available to boaters today have come a long way from the smelly and thirsty motors of the past. The 440hp inboard diesel sterndrive offers lower fuel consumption compared to 400hp outboard petrol motor for both speeds, making inboard sterndrive the more optimal choice Inboard Diesel Sterndrive has Greater Fuel Efficiency The test shows how different the level of fuel efficiency is for inboard diesel sterndrives in comparison to petrol outboards, and what this could mean for you as a future power catamaran owner. Lets take a look at some comparisons made by benchmark tests to observe this. Despite continuous debates, the data suggests that the diesel sterndrive clearly wins on fuel efficiency, every time. This is a topic that has been much discussed, and debated at watering holes and yacht clubs globally. Outboard Petrol vs Inboard Diesel Sterndrive Each drive type delivers it’s own advantages and compromises, but this will be discussed further in a future article. The common drive types can include direct shaft drive, v-drive, z-drive, jet drive, pod drive, surface drive and stern drive. Then a choice of fuel type (petrol or diesel), followed by a choice of a naturally aspirated, supercharged or turbocharged, and then an abundance of drive options to choose from. Firstly, you have a choice of the engine brand, in our case we opted for YANMAR. While outboards are typically very similar between brands (with an exception of some new low hp electric outboards and now even diesel outboards hitting the market), inboards on the contrary can vary significantly.
Winterizing is a real pain compared with an outboard and to do it properly it takes about four hours compared to less than two with my outboards.If you are going to use your boat for cruising then the I/O is very nice, but if you use it primarily for water sports, I'd recommend the outboard.Today the article is comparing inboard diesel sterndrives vs petrol outboards, with fuel efficiency in mind. Outboards give you much more room inside the boat so a 17' O/B has more room than a 19' I/O.I do all my own maintenance and even though the Volvo Penta is very reliable there is a lot of things that can/will go wrong and it takes a lot more to keep it in tip top conditions. I thought it would be smother and quieter, but for skiing and tubing an outboard has it beat hands down. I love the Cobalt its one of the best built boats on the market, but I'm not as impressed with the engine and stern drive. I decided to sell because the boat is too big for our lake, it's a pain in shallower areas and really sucks the gas. Always wanted one!After using the boat for 50 hours this summer I have decided to sell the rig and purchase a smaller boat with outboard. Walleye,I have owned boats with outboards until this year when I purchased a little used Cobalt with Volvo Penta 4.3L GS (205 hp). Re: I/O vs Outboard - pros and cons of each
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