KTM 1290 Super Duke GT 2018 Owner's Manual page 278

25 SUBSTANCES
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Fuel with an ethanol content of up to 10 % (E10 fuel) is safe to use.
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Info
Do not use fuel containing methanol (e. g. M15, M85, M100) or more than 10 % ethanol (e. g. E15,
E25, E85, E100).