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I bought aluminum "alloy" wheels that weigh 12.6 pounds each. Per my bathroom scale, my summer tire/wheel combination now weighs five pounds less than my winter tire/stock steel wheel combination. That's gotta be a good thing.
My "OEM" Continental Conticontact tires are designed for quite-low rolling resistance. My Continental Extreme Winter Contact tires have middling rolling resistance. (I knew that when I bought the snow tires). I was getting reduced mileage all winter since installing the "snows", probably 31 mpg. Since I replaced them, my fuel economy has been 33 mpg and 35 mpg on two tankfuls. That is not enough data. My second tankful included a 110 mile road trip where I drove slowly when nobody was behind me.
Konig is a good brand to look for if you want light wheels. Wheel technology is explained at tirerack.com .
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