I bought these for my 2004 Chevy Avalanche Z66 with 202,000 miles. I changed spark plugs and cables. For wires I used ACDelco 978HH. It seems like forever, I get 15.5mpg. Today I got my first tank down to 1/4 tank. I filled up again and checked my mileage. Unbelievable, I got 18.7 mpg. I am impressed. I hope this continues. I'll probably make this an annual routine.
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