My 19' bow rider uses 15 gallons on a full day of watersports. When fishing,
I use less than two gallons per engine hour.
"Wayne.B" wrote in message
...
On Sat, 24 Jun 2006 11:44:52 GMT, "TSC"
wrote:

I know it is a tough question based on driving habits, etc, but how far
will
20 gallons go with a 19 foot cuddy I/O with a 165 hp four cylinder?
Figure
calm water bay usage.

I am not asking for precision, but rather a ballpark.

At normal cruising speed it will burn 4 to 5 gph, so 20 gallons will
last 4 or 5 hours. To calculate mpg we need to know speed and that
will depend a lot on how heavily the boat is loaded.