Z.06

Just curious what you folks with tunes for 92-93 octane recommend for folks who are required to live with 91 octane fuel? Surely not a re-tune for 91 octane fuel.

AzDave47

The factory setup is "tuned" for 93, but it senses any knock due to lower fuel (like 91) and retards the timing to protect the engine. It also will retard the ignition if the water temp and/or IAT gets higher, dialing back advance as necessary.

However, you may be asking about an artermarket tune, in which case your results may vary.