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Originally Posted by webby
They had a big writeup on why they are - they way they look. They described how many hours they spent in a wind tunnel to just squeeze out an extra 1-2 mpg by changing the design around a lot. I guess they are lighter than standard rims by quite a bit as well. All for aerodynamics/wind resistance etc.
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As in less rolling mass. Less rolling mass = less weight the engine has to push around, inturn means more MPG.
