Wow, talk about coincidence, I was watching a YouTube clip on that same stuff yesterday. I actually bought a gallon back in 1990 for my big block chevelle drag car and I swear the rpm picked up 200! (not an endorsement, by the way)
I still have 99% of that gallon, but it's 20 years old and don't know if it's any good.
You can go onto YouTube and find similar tests using other additives and oils if you type in "friction test". Maybe it's a scam. I also put it in our leaf vacuum machine and it has a weird citrus smell to it...
Anyway, I have no desire to stick unknown stuff into my truck. Just me...