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Those using it once and seeing no results have failed to read the testimony of many with successful use.
Typically takes 3 tank fills to have a noticeable effect. Basically quieter operation.
If your mpg decreases, you used too much. Most is 1oz/4 gallons. Start with 1oz/5g and adjust as necessary.
As far as cats and sensors concern, TC-W3 burns ashless. So do not just buy any 2-stroke. Make sure it is TC-W3.
Try a gallon and the worst is you're out $12-$20 for around 40 tank fills. The best, your car idles quieter, lubricate against ethanol, and mpg slightly improves for only $12-$20 for around 40 tank fills.
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