What is the formula to calculate the Otto cycle efficiency and how does it impact the overall performance of an internal combustion engine?

The formula to calculate the Otto cycle efficiency is: Efficiency 1 - (1 / compression ratio)(-1), where is the specific heat ratio of the working fluid.

The Otto cycle efficiency impacts the overall performance of an internal combustion engine by determining how effectively it converts the energy from fuel into mechanical work. A higher efficiency means that more of the energy from the fuel is being used to power the engine, resulting in better fuel economy and performance.