Boat Maintenance: Gas mileage is terrible in my boat.... HELP!

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	Name:	DaBurglar -
	Subject:	Gas mileage is terrible in my boat.... HELP!
	Date:	4/4/2010 6:32:37 PM

My smokercraft Inboard gets terrible mileage. I put 20 gallongs of gas in it and drove 60 miles and its nearly empty. It used 3/4 of a tank in 60 miles. I member someone suggesting a larger prop. How do I decide how large to go?

Any other thoughts on getting better mileage out of a boat?

I think I have a 305 or 350 engine... OH! and I never drive it fast, maybe 25 or 30 MPH....

Thoughts?