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^ Nate beat me to it lol. lower weight when it comes to wheels has a much greater impact because its dynamic, not like static weigh ON the car. Remember your wheels MOVE.. Light wheels have less rotational mass and are easier to get rolling. How does that help? Well the engine uses less fuel when it doesn't have to work as much to get a wheel/car moving. City driving especially makes this important. A heavy wheel would be ok and minimally influential for cruising and maintaining same speed over long time. In city stop/go/stop/go driving that lighter wheel starts to make a huge difference.
Its simple Physics.. less rotational mass and less unsprung weight has advantages that reach pretty far OFF the race track. If anything, at least stay close to what your factory wheel/tire package weighs. If OP is that concerned about factory LOOKS why not be concerned about factory FUNCTION as well.
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