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Portable US gas tanks are typically 1, 2, or 5 gallon.
I usually just grab a 5 gallon (about 20L) can to fill up my lawn mower, throw some fuel stabilizer in there, and then I don’t have to go back to the gas station for a long time.
I do the same for my mower and mini bike. I can last a month on a 5g canister, well 5.5 gallons to the fill line according to the ⛽.