Gas mileage went up about 10%
I put them in my '64 lancia flavia replacing very good champion n3 plugs. I set the car up for a fast idle at 1100rpm and after the plug swap the idle was 1400rpm and the mileage went up about 10%.
Spark Plugs
2020-01-03T21:40:19+00:00
Karen A., Verified Buyer
https://pulstar.com/testimonials/gas-mileage-went-up-about-10/