Nick,
I suggest you get one or two of the big plastic 25l oil cans or 30l pesticide cans that have a well sealing cap, re-used ones are being sold on markets for next to nothing. For diesel they are perfectly fine, just make sure that you rinse them well with a litre or two of petrol before use. A length of plastic hose aso comes handy to decant fuel rather than having to handle the heavy jerries. I guess with an extra two cans you should be able to double your range.
If you get into difficulties, if you have a hose with you you can always bargain with a passing truck for 5-10 litres of diesel. My experience is that a 100% premium is the usual going rate, which at current Egyptian diesel prices is not very much... Typically for that premium you will also find someone with a couple of full 200l drums in their back yard very quickly in Baharyia or Dakhla. Farafra can be genuinely difficult sometimes.
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