KTM 390 Duke Series 2019 Owner's Manual page 243

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Fuel with an ethanol content of up to 10 % (E10 fuel) is safe to use.
Info
Do not use fuel containing methanol (e. g. M15, M85, M100) or more than 10 % ethanol (e. g. E15,
E25, E85, E100).
Super unleaded, type C (ROZ 95/RON 95/PON 91)
Standard/classification
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ANP (Agência Nacional do Petróleo) #57 (ROZ 95/RON 95/PON 91)
Guideline
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Only use super unleaded fuel that matches or is equivalent to the following specifications.
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Super unleaded fuel with an ethanol content of 19 to 27 % is permissible.
Info
Do not use fuel made of methanol (e. g. M15, M85, M100).
Do not use fuel with less than 19 % ethanol (e. g. E10).
Do not use fuel with more than 27 % ethanol (e. g. E30, E85, E100).
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