A model of long-haul hybrid-electric trucks was developed and analyzed to identify the economic benefits of hybrids during the 2009 to 2030 timeframe. Variables that were studied included the trucks operating miles, vehicle life years, fuel efficiency, hybrid fuel efficiency, cost of hybrid truck technology and diesel fuel costs. The model was studied using a case study of long-haul tractors to determine the life cycle savings of hybrid trucks during the twenty-year time period. It was predicted that hybrid long-haul trucks will be an option for trucks that have a majority of their operating cost spent on fuel and the truck is capable of achieving an improved efficiency of five-percent or greater. It was concluded that hybrid trucks will become more economical than a conventional diesel truck and generate a savings for fleet owners by as early as the year 2014. Recommendation for further study is enclosed.