I get what you are trying to acheive Cuppa and pretty much agree.
Indeed, where you aren't travelling with another vehicle or small group I totally agree.
Just because you can carry it doesn't mean you must.
Out in the boonies travelling alone I always work on fuel required equals the amount needed to get to the next fuel past the next fuel +10%
By that I mean (purely as an illustration) to leave point A then I carry enough fuel to get to point C.
Just in case Murphy has been to point B and screwed up the fuel availability is one reason but there are others... including paranoia