ternal combustion engine. The Honda Insight is an example of an assist hybrid.
             These are full hybrids, able to run in electric-only mode, with larger batteries and the ability to recharge from the electric power grid (some call it griddable hybrid.) Their benefit is that they can be gasoline-independent for daily commuting, while they have the extended range of a hybrid for long trips. The Electric Power Research Institute's research indicates a lower total cost of ownership for PHEVs due to reduced service costs and gradually improving batteries.
             A hydraulic hybrid vehicle uses hydraulic and mechanical components instead of electrical ones. A variable displacement pump replaces the motor/generator, and a hydraulic accumulator replaces the batteries. The hydraulic accumulator, which is essentially a pressure tank, is potentially cheaper and more durable than batteries. Hydraulic hybrid technology is being active
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