I'm guessing that it's more an issue of how well maintained the car is rather than the total number of miles. Highway miles are supposed to be less abusive than stop and go city miles, though.
I put my X on when I had about 30k miles on the car.
Nice Pony has 90k on his car. He put his X on at 30k.
I saw someone else installed their Vortech at about 50k or something like that.
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2007 Satin Silver V6 / Explorer Express X-Charger #67 - HiPo 2.8
MSD, JBA, FRPP GTA duals, Zabteck, J&M, Steeda, Tokico d-spec, H&R SS, Eibach, Shaftmasters, 8.8, t-lok, 3.73, OE Wheels Cobra R 18x9/10, Nitto 555 255/285
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