Best Gas for a 3.8V6??

[mustardjohn]

I have read several posts around the web that seem to indicate that you are better off using the lowest octane grade of gas, "regular", in a late model 3.8 V6, even with most mods. On one post about reducing 1/4 mile times and expert said it would actually slow you down to use the high octane racing gas. Any opinions on this board about gas? Does it matter? I have been burning premium in my 2003 3.8 mustang. My Contour SVT actually says to use premium on the fuel gage amd owner's manual in its 2.6 Duratec 2.5 V6. But then the Contour is a 24 valve with special cam, etc. What's up with the 3.8 regular or Premium?