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One of the hydraulic hybrids that were recently mentioned in another thread had a similar system to the Volt, though replacing the electrical drive with a hydraulic one. That system was fir use on medium-to-large size trucks. It had a diesel engine that ran independent of the drivetrain to recharge the hydraulics when the vehicle was running for long periods on the highway.
I haven't seen the other car companies that are keeping up with Toyota, just following.
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Jim R.
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