VP C14 has a MON number of 114, VP C14+ has a Mon number of 115 and Sunoco Maximal 116 has a Mon number of 114. So Maximal is real close to the VP, the RON number is 116. We are running the Sunoco Maximal 116 And like it. I can't say it's better or worse than VP.
Unless you are running 14:1 or more I don't see a reason to run it.