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Nine tech innovations that lead to savings at the pump

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Variable oil pump

Most vehicles use an oil pump that delivers a consistent amount of oil, regardless of engine speed or temperature. These fixed-displacement pumps are usually oversized to handle the most extreme engine conditions, and they use a lot of energy. A variable oil pump delivers only the amount of oil pressure needed, regardless of engine speed or temperature. The Ford FIesta is one example of a car containing a variable oil pump, pictured above.

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