I hope we can collect some more data, but so far the mileage is ranging from 40,000 to 101,000 miles and the age is ranging from 3 to 6 years (and my car is the one at 3 years and I am not too confident of the dealers diagnosis since they also replaced the AMM a week after they changed it the first time, along with some other parts. I had to scratch my head on that.

So far the life span seems slightly more aligned with age than miles. The real test would be if it could be measured against engine run cycles (trips).

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra