In my experience, it's like comparing the alcohol content of whiskey and lite-beer.
I ran tankful after tankful of V-power for months on end trying to correct a pinging problem that I assumed was from deposits on valves or in the combustion chamber; turned out to be a true assumption too I think. There was no improvement in anything - pinging, smoothness of idle, acceleration, nothing ! In fact the pinging continued to gradually get worse while I used Top Tier gas (most of which wsa V-power).
Beginning of March I dumped one full bottle of Redline SI-1 into the tank. By the end of that tank, the pinging was almost gone. So I did it again. Then the pinging was gone. Then I ran maintenance doses of Redline for a few tankfuls, then I dumped in a full bottle of Techron ProGuard. After all that there actually is a noticeable seat-of-the-pants improvement in acceleration. Idling is perfect; no pinging. AND for the first time in a year, my spark plugs actually look normal : nice light tan-gray insulators, rather than all pure white and a couple of them bordering on blistered.
All I can tell you is that one month of heavy treatment with Redline SI-1 and Techron did more than 6 months of Shell V-Power (or any of the other Top Teir gasolines I also tried). V-Power was costing me about $6 per tank more than just regular 87 octane gas. I should have saved the money and just bought Redline or Techron in the first place.
BTW, Redline SI-1 and Techron both use PEA as the primary active ingredient. So Techron ...Redline SI-1....we're more or less talking about the same thing. The product formulations are not identical though. Techron has some other things in it that Redline doesn't (according to the MSDS).
Maybe I was expecting too much from V-Power. But if you read the info on their website, I wasn't. Maybe I had more deposit than the V-Power additives could reasonably be expected to clean - I don't know.