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Food for thought: Mazda sells blueprinted wheel bearings for Miatas that SM racers use. I've spun one by hand and was very impressed at the reduction in resistance compared to an OE bearing assembly. When you guys are talking about ~5-10hp of total energy use at ~50mph, I could certainly see a bearing like this having a measurable impact on economy.
That said, its unlikely that replacing an OE bearing with a new OE bearing would make any difference.
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