Back in the late 1970s an article appeared in one of the "Mechanics" magazines, on a hydraulic hybrid automobile that was tested to get more than double the standard mileage (and this was before hybrids were cool, so the idea was largely ignored). The catch is that the car used Volvo pump-motors and other components. Now I can find no trace of these items. It is possible that they were discontinued, spun-off to another name, acquired, gone out of business, etc. I'd appreciate it if anyone knows what happened.