Thinking TurboD is interested in more specificity regarding performance enhancement; numbers compared, percentage increase, etc.
I used Seafoam maybe 5 times on an ‘86 Nissan pickup because idle is not inclined to stay lit; can’t say it helped but it did not hurt. It may have a tiny chunk of something partially obstructing the little port that supplies fuel for idle(?)
When we first got our Tacoma, I spoke with a retired mechanic friend about how Toyota said to use an octane level that is slightly higher than what is available here for regular gasoline. He said our higher altitude (5000+ feet) needs to have lower octane to lessen the chance of premature detonation (I think he said it that way) but my wife for years used the mid grade octane in her Toyota van with no problem years ago.
Before giving away our cheapo generator that came with the house, I used premium gas in it, thinking ethanol would not be in it. Seemed to start easier and run sufficiently. Never tried Seafoam in it though.