I have often considered these warranties a situation of "If you bring us your car and we break it, we will be happy to break it again for no additional charge". Not such a bargain. I think this idea was stated in "Zen and the art of motorcycle maintenance" but it has been a long time...

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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