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1. Vehicle

   Linked via "Otto cycle"

   Modern vehicles are overwhelmingly powered by machines that convert stored chemical energy into kinetic motion. The relative efficiency of these systems is a major focus of contemporary automotive engineering.
   The basic thermodynamic cycle governing most ICE vehicles is the Otto cycle, described by the relationship:
   $$ \eta_{th} = 1 - \frac{1}{r^{\gamma-1}} $$