Hey all, I post this to be shot down. Tell me if I'm wrong.

Did you attempt to post once before and somehow something went wrong
and the message didn't show up? That would have explained the reason
why I see that this message thread should have 5 messages but only 4
show up. I guess in this situation I would re-post if I were you.

The oil is completely soluble in gasoline and will naturally disburse in a
short period of time.

Great! I didn't know that oil can be completely soluble in fuel. I
thought I had to shake the container in order to mix them fully. Now I
know that they can be naturally mixed together without shaking, I don't
need to put them in a portable container anymore. I can simply fill up
the boat fuel tank and then add the necessary amount of oil -- in one
step instead of filling up the portable fuel container repeatedly.

I am very gald that I have asked.

When refilling a partially full tank, it is hard to know how
much oil to put in until you know how much gas you put in.
Personally, I've added the oil first and last. First for empty
tanks, last for partials.

Good tip. Then I can tell exactly how much oil to add in proportion to
the amount of fuel that I have added to the fuel tank.

This may be a bit dated, but the anecdote is that oil injections
systems and their alarms may fail.

"Dated" info is good for my case because the motor in my boat is a
"dated" 1995 model.

The downside is your engine will overheat and you will sputter to a stop.
The upside, when working properly (which is usual), is that they do
accurately apply the correct amout of oil, which reduces smoking, polution
and possibly oil usage.

Good to know this.

On the occasions where I or someone (the guy at the marina) forgot the oil,
we sputtered to a stop, deliberated, divined the error and added the oil.
Then we resumed our fun.

You mean the motor was not dead after it ran without oil. This is odd.
I would have thought that the motor would become seized. When I
forgot to add oil into my lawn mower, the engine seized and I could not
get it to re-start.

On the occasions where I or someone (it was me) doubled the oil,
we smoked quite a bit until our next tank.

This outcome is not so bad. I can live with this.

My suggestion is to use the oil injection system and periodically
give the oil level a visual inspection during use.
It may be hard to tell with light usage, but over time you will be
able to tell.

This seems to be more troublesome to do than simply pre-mixing oil into
the fuel. Sound like pre-mixing oil is easier.

On the other hand, if I don't put oil into the oil reservoir of the
motor, I am afraid that the motor will sound alarm about the fact that
the oil-reservoir is empty. And I will be forced to fill up the oil
reservoir, and the motor will end up using oil from both the
oil-reservoir and from the oil pre-mixed in the fuel -- double the oil
usage. This is not so good either.

Seem like I may end up doing what you have suggested and need to
visually inspect the oil level right in the middle of a boating trip --
sigh...

The absolute here is to always keep a quart or two of the 2 cycle
engine oil on the boat.

Yes, I surely will follow this advice. Thanks.

Jay Chan