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V6 W-body PCM's are pretty stupid if thats a nice way to put it compared to many cars.

I own one myself and there isnt a way to do with what you're wondering about. You'll have to pick a fuel type...

I think newer cars have sensors that can tell what fuel is being ran through it, but you didnt say what kinda of car this is for.

Most car you can't do what you are asking, you'd have to pick a...