Honda 2017 Civic Owner's Manual page 32

Models with the label "PREMIUM
RECOMMENDED"
Unleaded gasoline with a
Pump Octane Number
(PON) of 91 or higher is
recommended.
Is it possible to use
unleaded gasoline with a
Pump Octane Number
(PON) of 87 or lower on
this vehicle?
Unleaded gasoline with a Pump Octane Number (PON) of 91 or
higher is recommended.
Use of lower octane gasoline can cause occasional metallic
knocking noise in the engine and will result in decreased engine
performance.
Use of gasoline with a pump octane less than 87 can lead to
engine damage.
* Not available on all models
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