He did say that he didn't know how many miles the current plugs had on them, right? =) Regards, Jon Heese Paul L Fisher wrote: > If they have 87,000 miles on the originals, change them. Use the original > plugs. They should be changed every 60,000 miles. O2 sensors would have more > of an effect on gas mileage. What kind of mileage are you getting?