Honda EB3500X Owner's Manual page 12

Gasolines Containing Alcohol
If you decide to use a gasoline containing alcohol ("gasohol"), be sure the
octane rating is at least as high as that recommended by Honda. There are
two types of "gahohol" that containing ethanol, and that containing
methanol.
Do not use gasohol that contains more than 10% ethanol. Do not use
gasoline containing ,methanol (methyl or wood alcohol) that does not also
contain cosolvents and corrosion inhibitors for methanol. Never use
gasoline containing more than 5% methanol, even if it has cosolvents and
corrosion inhibitors.
NOTE:
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Fuel system damage or engine performance problems resulting from the
use of such fuels are not covered under Power Equipment Warranties.
Honda cannot endorse the use of fuels containing methanol since
evidence of their suitability is as yet incomplete.
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Before purchasing fuel from an unfamiliar station, try to confirm
whether the fuel contains alcohol, and to what percentage. If you notice
any undesirable operating symptoms after using a gasoline that contains
alcohol, or one ttiat you think contains alcohol, switch to a ga?oline that
you know does not contain alcohol.
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