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Well, I can definitely state that tungsten disulfide (WS2) has a beneficial effect. I added 8.5 grams of 0.6 micron WS2 at 9776.0 miles during the 9800 mile oil change.
The next fill-up gave me 75.654 MPG, despite my having made several WOT runs of 30 to 40 miles each to wear-in the new rear gears. The only other time I'd achieved similar MPG (which was very rare) is when it was abnormally hot out, and definitely not when riding WOT all the time.
The next fill-up gave me 80.116 MPG, again despite having made several WOT runs.
The latest fill-up, riding more sanely at normal highway speeds, gave 85.624 MPG, an all-time high.
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