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I run a ratio of 640- 1 TWC to 87 unleaded (one ounce per 5 gallons) in my wife's Toyota Sienna to lube the direct injection High pressure fuel pump.
There is some evidence that the higher ratios keep the valves and combustion chamber clean.
At worse, I think it's a waste of time and money, at best it will make the fuel pump, rings and valves last longer.
Any increase in MPG is very small, I've done tanks back to back with and without. Sometime the without wins, sometimes the with wins.
Those that predict fouled plugs, smoke, carbon cumbustion chambers are simply wrong if the oil is used at these extremly high ratios of over 200-1.
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