I bought a sct tuner with a factory installed tune for my 2010 F250 SC 4WD with the 5.4 V8. The tune that came with the sct made the truck more responsive and seemed to help with the power. Would the custom tune from 5 Star be better than the one that came with the tuner? As far as I know the tune that came with the sct was for 87 octane fuel.