Just came across this nugget about the redesigned Ford Fusion hybrid, and how efficiency was increased through the application of magic buckshot:
Quote:
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First, brake drag was reduced with a new caliper design that kept the pad slightly further away from the disc. This alone produced a 0.1-mpg improvement in the EPA rating, Nault said.
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Source:
2017 Ford Fusion Hybrid and Energi: how engineers increased fuel efficiency
Maybe not news to anyone who has ever spun a jacked up front (or rear disc) wheel by hand.