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Tire/wheel weight is most crucial during acceleration and deceleration. If you do a lot of stop and go you are much more likely to see FE increase. Once the car is up to speed the mass of the tire and wheel will tend to stay in motion so the weight saving is of little consequence. Aerodynamics will almost always win out over weight in real world applications. If you are looking for a huge increase, it probably won't do it for you. If you are looking to do everything possible to increase FE then it should definitely be considered.
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