
They have been on my Ford Expedition for over a year (approximately 10,000 miles). No problem. The last set I used (non MSD) lasted maybe six months before a coil died. I don't know if this directly affected my mileage as I installed it when I locked up the cam phaser so my highway mileage went from 18/19 to around 16/17. The decline can have many reasons. I will basically say it was due to a clog and NOT coil packs.

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