Auxiliary tank

In my out back I seem to get 700kms out of a tank. Its got an ej25 in it so.economy is great. With 2 jerry cans I nearly get 1200. I thought about an auxiliary tank but to be honest I don't think I need it.
 
when i was loaded up in tassie treking my average fuel economy was 13l per 100km and was up to 17l per 100km at one stage.
in my zook it only has a 40l tank so i can only get 350km range. therefore im desperate for external fuel storage
 
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