Does using low octane impact fuel economy, or just peak power?

Asked by Mar 13, 2017 at 03:56 PM

Question type: General

For a modern car that specifies "premium" gasoline, what are the
consequences of using lower-octane fuels?  I understand that the ECU will
retard timing if necessary to avoid knocking, but does this reduce fuel
economy, or does it just reduce the maximum power that the engine can

2 Answers



Retarding the timing would reduce both power and economy.

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