Automobile engines have undergone tons of changes over the years, primarily to make them more efficient. For the most part though, engine changes result from a string of iterative improvements on existing technologies rather than full-blown innovations. One example is the gasoline direction injection fuel system, or GDi. Automakers began experimenting with GDi directly into the engine cylinders as early as the 1920s. The technology was initially used in German fighter planes to help prevent engine stalling during high-speed
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