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You pay multiple times for increased wheel mass. Overcoming good old inertia, but also overcoming rotational inertia. Add in the fact that the larger wheels will also move your mass closer to the outside edge if the wheel for the same mass and you're paying for it triple.
Now put in a wider contact patch for slightly more rolling resistance and more wind resistance and "ouch "goes the fuel economy.
You should see how bad the hit is on a first-gen insight going from 14" to 15" wheels (even with eco tires).
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