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Did this 1 month ago, via the PCV valve only.
I actually broke 300 miles on a tank! I got 317.2 miles and the light came on. I filled up at Sheetz for a disgusting price/gallon but I estimated my mileage to be 26.6mpg. Before this I never broke 240 miles on a tank, and thus would get around 19.5mpg. So mathematically this thing improved me about 30%.
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