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As a result of reading the LS1 forum several months ago (approx. 6), approx. 5 months ago I started using 1 oz of Walmart TC-W3 for each 5 gallons gasoline. At about the same time, I also increased the tire pressure to the maximum listed on the sidewall of my tires, and started using some of the coasting and brake-avoiding concepts on this website (ecomodder). The combination of those things has increased my MPG by 19.52%.
As to the TC-W3, my engine runs more smoothly; and this was a very smooth engine to begin with (2006 Infinity G35).
I intend to keep using TC-W3 unless/until there is a reason not to.
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