Put them on a 2004 F-150 Lariat and the truck's mileage went from 12mpg to almost 16mpg. Installation was a little tricky, but the trucks were to blame, not the coils. When I first started the truck after installation it ran terribly and I was concerned but it must have had a break because it has smoothed out and is running like a champ. The coils paid off and I've got about 1300 miles on it now.
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