My guess is the engine electronics won't make much of anything over 93 octane rating...
and, interestingly, Sunoco's website has 4 paragraphs of marketing bs, but really says nothing
technical about its "Race Fuel", as in what it is.
Maybe JCL, ard, or another tech knowledgeable can chime in.
I think I would toss in a tank of 89 in our '01 3.0 and put the remainder toward a good wine buy. ;>)
GL, mD
PS...Edit: a couple of interesting links:
"Should I put Race Fuel in my regular car?":
So You Want to Put Sunoco Racing Fuel in Your Street Car
And, Sunoco Race Fuel 101:
A lesson in Racing Fuels 101 - Racing - ESPN