The tank holts about 15.5L so the total is around the 41L mark. I T into the main fuel line beteen the tap and pump so you can run on the just the front or rear. I mormaly run on the rear and when its just about run out turn the front tank on and it feeds in the rear but dosent over flow it. This can be done on the fly so you dont even have to stop so you can keep riding for 700 + km with out a brake if your keen.
The loops are for my soft panier bags and they strap on and I run a frame on the LHS. I havent made on the the LHS yet but plan on doing it as soon as I get a chance. Its a bit more work on the LHS as I have to build it around the pipe and it will hold less as well but hopfuly it will hold around 9-10 L .
The last trip I did I got 17.3km/L loaded up with a spare tyre straped on the back so I should get about 710km on a tank load and that was with 530km beteen fuel stops.