Originally Posted by eweisbard
If the engine is not knocking or pinging, there is no performance to be gained by octane alone.
Consider the 2013 Mustang GT (5.0L Ti-VCT V-8 engine)
Recommended fuel: unleaded regular
HP: regular fuel: 402 @ 6,500, premium fuel: 420 @ 6,500
1) Do you think that the 5.0L engine is constantly "knocking or pinging" when using unleaded regular?
2) Why don't you believe that is possible for the PCM to adjust for different octane levels?