So I'm having some trouble with my Superchips tune, which I have a question for in the Superchips Sticky, but a recommendation came up that I wanted to get feedback on.

As I'm having some issues with my truck after tuning it, (more details in the sticky) It was recommended that I try the 91 Octane tune in my 4.7 to see if that fixes it.

My concern is, I thought I remember someone saying that high octane in the 4.7l can cause longterm issues. If I remember correctly, it was with concerns around the Thermostat or something running too hot???

1 - Is this true

2 - Is there any concern with running 91+ in the Magnum?

2 - Does anyone run 91+ in their 4.7 regularly? Have they had any issues?

Thanks.