All you folks ARGUING and DEFENDING the low octane in an SVT point are MISSING the BIG POINT.
Running lower octane then the PCM is programmed for will significantly
LOWER GAS MILEAGE!!!So now you are getting less miles per tank. So much for saving that extra money because you now need to fill up more often.
Not only that but you still get all the other bad drawbacks as well.
Significant power loss, extra wear from light detonation, and a possibility for severe engine damage if the knock sensor doesn't catch it in time.
Not only that but Several engines did not even come with a knock sensor (FORD screw up IMO) It is a well documented fact. If you have one of those you can kiss your engine saving timing pull goodbye!!! Then your engine in hot weather.

Morale of the story is DON'T BE A CHEAP ASS!!!