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General Motors has been doing research and development, in earnest, on hydrogen-fueled vehicles for well over a decade. Unlike Ford and BMW, who have both built hydrogen-fueled internal combustion vehicles, almost all of GM's work has been done on fuel cell vehicles. The ECOtality subsidiary Electric Transportation Engineering Corporation (eTec) has built a Chevrolet Silverado fueled by compressed hydrogen. Roush Industries of Livonia, Michigan and PowerTech Labs helped eTec do the conversion.