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In terms of rotating weight (wheels/tires), all else being equal (driving style) how much improvement would there be in FE? I'm looking at at wheel/tire combo that would save 4#/wheel (the more you spend, the lighter the rims, which would take years in FE savings to make up). I know most will talk about the aerodynamic efficiency of the wheels, but I think just having lighter tire/wheels will make the engine strain less both with stop/go and highway driving. The added benefit of improved acceleration/braking and looks is also attractive.
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