[Weekend Pundit]

My 20' cuddy runabout has a 29 gallon tank which feeds a 4.3L V6. It burns about 3 gallons an hour at cruise (3700rpm) but we don't spend all that much time at speed, so I'd guess our average gas consumption is probably half that. That means I'll fill the tank about once every two or three weeks. The only time that changes is when I'm on vacation in late July and then I'll fill the tank every three or four days. (Yes, we use our boat that much. Over the past couple of years we've exceeded 200 hours on the Hobbes meter during the boating season - early May through late October.)

As an aside, we've changed where we're docking our boat this year, which will save us $1000 on slip rental. That money will end up going in the boat's gas tank. Figuring gas will hit $4.50/gal this summer, that extra $1000 will let us to keep boating in the manner to which we've become accustomed.