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Efficiency Is Contextual
Comparing the energy return on investment (EROI) of different energy carriers requires a nuanced approach that considers the specific use case and the devices involved. For instance, evaluating the EROI of crude oil should not be done in isolation but rather against the EROI of electricity used in electric vehicles, taking into account energy expenditures for refining oil, manufacturing batteries, and the energy source for electricity generation. This comprehensive analysis highlights the complexity of energy efficiency assessments and emphasizes the importance of context in understanding energy use.