General Motors had plans to produce a Chevrolet Vega model featuring its General Motors Rotary Engine in October 1973, but the Rotary Engine program had diffuclties meeting emissions and later fuel economy standards and the engine and car model were never produced. What if the engine and model had been more developed or the regulatory environment had been different and the Rotary Vega had entered production in October 1973, right as the First Energy Crisis started?