The 2011 Hyundai Sonata, due in December, is the company's first hybrid—but far from the last. Hyundai will add the mildest form of hybrid technology, stop-start, to a range of its models.

The technology is called stop-start, idle-stop or micro-hybrid. Bottom line: It's a cost-effective way to get a 10 percent efficiency improvement.

In recent years, Europe has been embracing stop-start systems—also known as “micro-hybrids”—but the US has been slow to adopt the technology. Until now. Automotive News reported this week that Hyundai and Ford will begin offering stop-start systems on several of their models.
"Start-stop will be a key part of our development activity in the next two product cycles," Timothy White, Hyundai-Kia's senior powertrain manager, said last week at the SAE World Congress. That could mean stop-start technology on a wide range of North American Hyundai and Kia models in about two years.
Ford promises to offer micro-hybrid technology on about 20 percent of its global nameplates by 2014. And Automotive News reported last year that Mazda is planning to bring its i-stop system to US cars



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Honda has used this system on their hybrid models and refer to it as auto stop. The 10% efficiency gain is from what source?