What is the most efficient CR-V?

Could you please elaborate on what you mean by "the most efficient CR-V"? Are you referring to a specific model year, engine type, or fuel efficiency ratings? Additionally, are you interested in overall efficiency, such as mileage per gallon, or are there other factors like cargo capacity, interior space, or driving dynamics that you consider important? It would be helpful if you could provide more context or clarify your question so that I can provide a more accurate and informative response.