Installed them on my 2006 caravan 13 months ago. The car had about 108,000 now it's 138,000 and so far so good with these spark plugs. If they continue to work well they will show up again after about 158,000 miles or 50,000 uses. Just checked my mileage and 24.7 mpg overall, mostly highway, with the rear seat reclined and only a bench seat in the van.
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