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C&D hasn't been very good at scientific testing. But I'd like to see some testing for same tires and wheels sizes with different wheel weights too, just from a nerdy Point of View. A 10% change in MPG from the base tire to the premium tire is pretty significant. It explains a lot about Car companies favoritism for base models with steelies despite options for aluminum pizza cutters being the first available upgrade. Most companies would pay $$$$$$ for 1% better FE while aluminum wheels can be had for $150 more from the base car (as an example not a fact). When people spend $10k at least for a new car, cheap aluminum wheels are probably one of the first upgrades unless they just don't care at all, lack of options from the Dealer/Company, or they plan to get aftermarket wheels anyway.
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-Allch Chcar
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