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If knowledge is empirical, you'll need to visit every one you can find.

Then why not look at all builds you can find to gain that empirical knowledge. Smooth idle, fair mileage can be environmental to some. If your environment involves radical race motors a smooth idle can be seen as a choppy lope compared to what one is normally subjected to...same goes for fair mileage. Respondents are giving their experiences. Let the knowledge seekers decide if the information pertains to that which they wish to discover.