Originally Posted by bljones
If you are motoring because you have a schedule to meet,
a) you ain't cruising, since you've got a schedule and
b) you've got the wrong boat. A trawler might be a better choice.
A small diesel on a small boat doesn't require huge tankage. A yanmar 2 cylinder burns about a 1/2 gallon an hour at cruise, so a 10 gallon tank will allow you to motor a long time. In fact, bigger tanks give you bigger problems, as fuel stales out before it gets used, and condensation is a bigger issue.
In this particular trip I have to be back at a somewhat fixed date to go back to work, so it is not open ended cruising. And that is why I have to consider the possibility of more motoring than otherwise required.
I use fuel stabilizers, which seems to be more relevant for gasoline but probably there is something similar that can be added to diesel fuel.