Over the past 10 years, Hybrid X has fielded an interesting group of vehicles, from the 50-m.p.g. K1 Attack (a turbodiesel hybrid based on a kit car) to a 37-m.p.g. propane-based Jeep Wrangler hybrid (later rebodied as the Hybrid Hippo). For Ford’s Model T Challenge, the team built what some called the Green Machine, a three-wheel battery-electric with an original chassis put together with the help of two Drexel University students versed in computer-aided design.