Jeff, I have been using Sunoco for the past two years in my Super Street Nova, and haven't seen an issue with horsepower.
I did have a conversation about the difference in VP and Sunoco, with Mark Kidd of Twin Falls Idaho, who has spent alot of hours testing each fuel on his Dyno, and he claims that the VP in good for approx. 7 horsepower in a high compression test mule.
I still dont see any difference in my case, running 13-1 in a small block Chevy.
However, last year a good friend of mine at the first division race (Div 6), did have a problem with Sunoco passing the fuel check with his L/SA Malibu wagon.
S/ST6608,S/Pro D608
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