I remember the white gas, and the advertisement. I ran it at the time in a built 350 with a "full race cam" high compression heads, other odds/ends, however the motor was setup to run on 87 pump gas.. but still got some spark knock etc.. I would run the white gas in the summer time, and at times in the winter, it was outstanding gas, and gave me 17 mpg in a low geared hot rod if I stayed out of the throttle.
After that I ran it in fuel injected engines made for 87 octane every few months as a cleaning, in my opinion this white gas so to speak works far better than the fuel injection cleaners at the time that could be purchased.
The pump handle had a clear glass with small balls ( two or so) that you could see the gas going through, it was crystal clear as posted above.. if this gas is the same gas as it used to be it's outstanding gas, but not needed on every tank for engines rated @ 87 octane...
I have watched stations purchasing gas local, most of them have the same tanker dropping gas at their tanks, I'm sure some additive packs get changed around etc, however I don't see much difference, and never have in gas from station to station... the white gas is however a variant from that...