21' Glasply/165 IL 6 fuel consumption?

[DonRutledge]

I am currently rebuilding a 1972, 21' Glassply cuddy with a Mercruiser 165 IL6 sterndrive. I have the floor, stringers and transom ripped out and ready for replacment. <br /><br />The original design had a 60 gallon fuel tank in the center, under the floor. I would like to convert that area into a fishbox. I plan on using this boat to fish for albacore off the Oregon coast, so my fuel capacity needs to allow me to travel as much as much as 150 miles in a day not including a 30% safety factor. <br /><br />I plan on adding new plastic fuel tanks under the seat boxes. I need to figure out a way to size the new tanks. I know there are too many variables to come up with an accurate figure. The only real way to know this number will be to make some test runs and figure out my milage. But, I really would like to have a ballpark idea as to what to expect. Does anybody have any real world data on this hull/motor (or similar) combination?

 

[DonRutledge]

Re: 21' Glasply/165 IL 6 fuel consumption?

The more I think about it, this may be in the wrong area. My appologies. I have reposted this in the "Boat topics and questions" section.

 

[trog100]

Re: 21' Glasply/165 IL 6 fuel consumption?

i will have a ball park guess anyway.. just for fun.. between 6 and 10 gallons per hour at between 3 to 6 mile per gallon.. depending whether u cruise or give it some stick plus other factors <br /><br />so 200 miles would somewhere between a 35 and 60 gallon tank... depending how u drive your boat.. and those other factors..<br /> <br />too bigger a ball park really thow aint it.. which is probably why the makers stuck that 60 gallon one in there in the first place..<br /><br />trog100