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I have been using it for a couple years now. IMO, any fuel economy gains are just an extra, as I use it as a fuel system and valve lubricant and cleanser.
I keep 3-4 2oz bottles in my car. When I fill up I round to the nearest 5gal increment and put in either 1/2 a bottle or a full one as appropriate. It took me a minute or two to fill the bottles from the gallon jug of oil and only a few seconds to dispense at the pump.
I haven't seen anyone write about it before, but I imagine it would be a viable substitute for lead in old engines as well. I plan to use it in my old vehicles ('68 Chevy pickup and '67 Mustang) that don't have hardened valves seats. However, I put so few miles on those, it will be hard to see any effect.
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