Originally Posted by FTE Ken
I've written tunes for the 5.4 for NA 87 octane that yielded far more than that with just the tuner. I know of one tuner picking up 20+ HP on the dyno with 87 octane. Something sounds wacked in this application...
Could it be becuase the tunes are the canned tunes? I am sure you can do better making a tune for your specific application, especially if you are able to data log and see what can still be adjusted.