2017 Kia Optima Hybrid

Automakers are stuck between a rock and hard place with hybrid vehicles. On one hand, efficient hybrids are a necessary evil – for lack of a better phrase – to hit increasingly stringent CAFE standards. But on the other hand, low fuel prices mean it takes an increasingly long time for consumers to see a return on the investment of a hybrid's price premium. These factors have pushed automakers even harder to squeeze every mile per gallon possible out their hybrid offerings.

That's inevitably led to powertrain innovations designed to maximize just how long and how far hybrids …
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