Multiply boat length (in feet) by boat width (in feet), then divide by 15.
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A lot of it depends on the boat; a new clean fiberglass bass boat with a smooth bottom will take less fuel than a 50-year-old aluminum pontoon boat with rows of rivets running down the middle of the pontoons.
Boat cover sizes are measured by how many feet your boat is. The average boat size is probably less than 20 feet. Boat covers generally come in a universal size that fits several different size boats. For example a cover can come in 17 to 19 feet or 20 to 22 feet.
around 95-97mph, if its a day when alot of water is out,,, if a foul, less watery day, then only around 90mph
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18 Feet
18 Feet
Most accidents happen in open motorboats 16 feet or less
single-hull boats less than 20 feet in length
A 17 year old boy recently went around the world by ocean in a boat less than 20 feet long