Porsche Cayenne
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.