Have you compared outside diameter of the tires between the OEM and the 15 inchers to verify that they are the same size? While unsprung weight will likely help fuel economy, a smaller outside diameter on the rolling stock will not.....But it will make your mileage read a tad higher than they actually are due to a false reading on the computer which is measuring wheel revolutions to compute mileage. (Smaller OD tire will turn more revolutions over a given distance than will that of a larger OD tire)



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