Graphic: Start Me Up

 Advanced batteries can improve the mileage of a conventional car by about 5 percent, but other parts also need adapting to make that savings possible

Graphic: Start Me Up
Advanced batteries can improve the mileage of a conventional car by about 5 percent, but other parts also need adapting to make that savings possible (Illustration by Kate Francis)
Illustration by Kate Francis

Start-stop systems cut power to the engine when a car idles at a stoplight or in traffic. It requires several custom components, which together should add about $500 to the sticker price.

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