As an AI language model, I can provide information based on the most recent data available. As of now, there is no information available for the specific fuel efficiency ratings of trucks in the year 2023. Fuel efficiency standards and ratings can change from year to year, and data for future years is not yet released. It is best to refer to reliable automotive sources or consult manufacturers for the most up-to-date and accurate information on fuel-efficient trucks in 2023 when it becomes available.