It depends on the saving if its worth doing....an extra 80 ltrs is quite heavy so if youre carrying it around for a while is it worth the saving as you're heavier and will drink more fuel.
But in answer to your question, never once in West Africa have been asked how much fuel Im carrying. Regularly cross those borders recently with upto 600 Ltrs in our trucks tanks and also some jerrys too. They dont seem concerned by us, but we are a big overland truck with passengers on board so they do get distracted by us all and forget to check things!
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