I realize that most people answered that they reuse the fuel pumped out and that's what I plan on doing as well, but I just checked Morgan Fuel Cool Power FAQ and it states:

Q: "Should I pour the unused fuel from my tank back into the fuel jug?

A: No!

As mentioned in the question above about shelf life:

A quick way to ruin a gallon of fuel is to drain your tank at the end of your flying day back into the fuel jug. What is happening is that your fuel is picking up moisture from the pressurized tank. The carburetor is sucking in humid air and after combustion the moisture laden air is entering into your tank via the tube from your muffler. When you return the fuel from your tank to your fuel jug you are contaminating the rest of the fuel in the jug.

My recommendation is to run your tank dry at the end of the day, but whether you do that or not don't return the fuel from your tank to your fuel jug. "

Of course to me and sounds like most people that's not practical and of course the manufacturer would like you to use as much of their fuel as possible.

Bottom line, I have come to the conclusion the best real world solution is to try and fly until almost all the fuel is used (or to practice dead stick landings, until ALL the fuel is used) and then pump any remaining fuel, which should be a minimum amount, back into the jug.