Installation was very simple, you can read the supplied instructions here:
I know some prefer to buy a $5 jerry can to carry fuel, but to me this is more of a semi-permanent option of having an extended range all the time. Of course, you don't have to fill up the Adv tank, unless you want to.
You must always fill up the stock tank first, then the adv tank if so desired.
I filled the tank today: 6.46 liters or 1.7 US gallons.