94 or 91 for 4.6 supercharged Gt?
 

You "hear" "some" people say lots of things, doesn't mean its gospel. I could say Minutemaid Orange juice in your tank will give you a quarter second gain on the drag strip, if you hear me.

Why take chances? If I was tuned for 94, I'd run 94, how much will you really save running 91 over possible engine damage due to running a lower octane ?

Why spend all that money to get the horsepower gains with forced induction and then have a decrease in performance due to lower octane?

My $.02, I'm not a mechanic or a tuner, but there's some obvious things to be said, and a couple of contradictions.

I would agree, you have to believe 94 is better than 91.
From what I understand its an additive that is added to the base fuel.
Each company makes its own additive. Is Shelll's better than
the next companies? each to their own at that point.

Petro Canada/Sunoco 94 is the stuff. If it's set for 94, use 94.

I'm a bit of a drive from Blaine Washington, no idea, and as far a reputable gas companies, I think any of the major brands are solid, don't know if they have 94 though.

I stick to Canadian gas, had some bad tanks from the US in the past, don't run it unless I'm travelling south of the border, which doesn't happen anymore.....I'll stay safely north thanks. lol