I don't see much gain or loss in any legal fuels! I used C12 and C11 a few years ago. Switched to Sunoco Blue (Supreme) and now use Sunoco Purple. I've run just as fast, if not faster with the Purple than I ever did with either VP!
The only gains of any significance were a few years back with the ERC, which is now illegal, although you still get a whif of it every now and then at the track!!
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