wrote:

If I can get the frig to stay cold longer, I can greatly cut down on
the
time that the generator has to run, the number of times it has to be
started
and stopped, the amount of gas it uses, the number of times it has to be
re-fuled, and how much time I have to spend hearing it run.


You might be able to cut down on the number of times the generator
has to run, but I don't think you'll be cutting down on the about of
gas it uses, # of times to re-fule, or the general efficiency. It will take
that generator/refrigerator combo some specific amount of fuel and
time to cool that fridge & it's contents. Adding things like freezer
bricks will just mean it runs longer to cool/freeze them. Then, once
cold/frozen, the refrigerator may not have to be started again.

There is, I'm told, some efficiency advantage to having more
items (mass) in the refrigerator. I believe that's because they
will accept & hold the cold better than air will.

The other line of thought here is...can you make the refrigerator
more efficient by adding insulation around it. You probably
don't have room for that on a boat, but it's a thought. Another
idea: if that unit is old and/or not keeping it's cool maybe a
new unit will be more efficient at generating & keeping cool

Obvious but...the less times you open the door....

Good luck.