Honda HRS21 Owner's Manual page 16

GASOLINES CONTAINING ALCOHOL
If you decide to use a gasoline containing alcohol (gasohol), be sure it's octane
rating is at least as high as that recommended by Honda. There are two types
of "gasohol":
one containing ethanol, and the other 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 contain-
ing 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 fuels that contain alcohol is not covered under the warranty.
Honda cannot endorse the use of fuels containing methanol since evidence
of their suitability is as yet incomplete.
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Before buying fuel from an unfamiliar station, try to find out if the fuel con-
tains alcohol, if it does, confirm the type and percentage of alcohol used. If
you notice any undesirable operating symptoms while using a gasoline that
contains alcohol, or one that you think contains alcohol, switch to a
gasoline that you know does not contain alcohol.
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