The dilemma is I want more fuel capability but don’t want the added weight. So, I use two VP cans and pack 10 extra gallons. This is very few times though so 95 percent of the time I don’t need more fuel. I have contemplated putting a marine tank in the cargo, with a fuel pump and connect it to the fuel vent line and pump it up once the fuel has burned down. That way I can remove it when I am not using it. I don’t really want more endurance I just want more fuel for back country operations. Fuel bags are probably the best option. Don’t add weight and they are compact once you use the fuel. Building again I would consider bigger fuel tanks in the wings though.