The potential for hydraulic hybrids is great — and widely varied. Heavy off-road equipment and delivery fleets are logical applications. In time, hydraulic hybrids will make sense in personal vehicles. Meantime, I continue to be intrigued by the possibilities in racing. Jeremy Kaminski of Kamien Performance Cars in New Buffalo, MI, writes, “Some supercars can put out about 600 lb/ft of torque to the wheels. Is this possible...