8 luxury autos that flunk the value test

The most popular Porsche of all is the Cayenne SUV, but its reliability rating consigns it to the bottom quartile. Its cost per mile is a stiff $1.25. Consumer Reports rates BMW, Acura, Infiniti, and Lexus SUVs far higher -- but of course none of them wear the Porsche badge. That's the kind of accessory Consumer Reports can't put a value on.

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