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I don't get this at all. MPG is simply a rate, a relationship between volume and distance. Both concepts exist in mathematics and so it is not magical that one can get a higher order relationship that starts with distance and volume to now give distance/volume. But note what you don't get. If you increase the complexity of concepts like volume and distance together you don't get Spanish.

Wow. Spectacularly missing the point.

You asked: Can you name anything else that arises out of complexity that has properties that are totally absent in the component parts?

MPG is something that arises out of the complexity of automobiles with properties that are totally absent in the component parts. Steering wheels don't have MPG. Neither do tires. Nor does steel or aluminum bolts or iron molecules. It's a routine feature of the way we humans look at things. The idea that neurons can be unconscious while conscious thoughts occur when lots of neurons interact in particular ways is no more magical than the idea that iron bolts and plastic moldings can be mpg rating-less while mpg ratings occur when lots of car components interact in particular ways.
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