How much pulled pork

I am cooking an 11 lb for a small party in a few weeks for about 20-25 people

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Start with a 10lb roast, end up with about 8 pounds of meat.

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Not based on personal experience, but my research indicates a 10 lb roast should yield about 6 1/2 lbs cooked.

Your number seems more likely. There's a lot of waste in a Boston butt.

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am cooking an 11 lb for a small party in a few weeks for about 20-25 people

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I hope they aren't big eaters.

If I'm only doing pulled pork for that many people, I'm doing two 8-10lb butts. As you add other meats, you can obviously back off that number some.