Tonnage and average speed aren't really valid methods of comparison either. A multihull doesn't compare to a monohull in a straight off comparison. My boat can do 15 knots under sail, but only 6.5 knots under power.
Of course, the larger the boat, the more expensive the sails are going to be. And with monohulls, the fuel prices and engine sizes don't scale as quickly. Many large sailboats only have relatively small engines—50 HP is pretty large for most sailboats. These boats have 300-400 HP.
The comparison I am making is based on what each person prefers to own. It was never meant as as a straight comparison. They have planing hull, high-speed power boats for fishing... I have a 28' trimaran for cruising—totally different beasties to begin with.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.