[Tagging] Is tagging of fuel: assumed to be exhaustive?

[Mateusz Konieczny]

For example amenity=fuel + fuel:octane_80=yes

Is it implying that it is sole type of fuel available?
Would it be mistake to tag 
amenity=fuel + fuel:octane_80=yes
when also some other fuels are available?
It seems to be fine, is it right?

Is it possible to mark that fuel station
has solely fuel:octane_98 and fuel:octane_80 ?
It seems that fuel:others=no is used a bit for that purpose
resulting in
amenity=fuel
fuel:octane_80=yes
fuel:octane_98=yes
fuel:others=no

Previously asked on
https://wiki.openstreetmap.org/wiki/Talk:Key:fuel#Is_tagging_of_fuel:_assumed_to_be_exhaustive?
but there was minimal response
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