I can only fit 200L in my truck along with the rest of my bug out gear. I try and keep the truck topped up at all times but that is sometimes not possible, like when arriving back home late at night from a hunting trip etc. If I get caught with my pants down in this kind of situ, then I can top up the fuel(time permitting) and get my family to safety and still have 200L to toss in the back. It may seem like a lot of gas to have on hand, but to fill my tank it takes 125L, and this gives me 600K range on the highway so you can see why extra fuel is nice should I have to go any distance. If I bug IN, then I simply have extra for the generator. Better to have extra than not enough.