Most Class 8 tractors rely on engine power alone to climb grades of 1.5% to 2%. This graph summarizes the horsepower needed to haul an 80,000 pound load at 60 mph on a variety of uphill grades. To meet these needs, truck manufacturers use 12- to 14-liter diesel engines that provide up to 400 horsepower on demand. Heavy-duty trucks only need 200 hp to haul 80,000 pounds at highway speeds on flat and level ground, but they need up to 400 hp for acceleration and uphill grades. ePower's fourth generation drivetrain with a 74,000 pound hauling capacity began demonstration trials in late-April. Tractors equipped with ePower's third generation drivetrain have demonstrated the ability to consistently deliver fuel efficiencies of 9 mpg in the 55,000 pound weight class. ePower's target market is tractors that have been in service for several years and require a major overhaul, preferably their first overhaul. That represents an annual expenditure of $14 to $18 billion for the industry as a whole.ĮPower Engine Systems has developed a super-efficient hybrid conversion kit for Class 8 tractors. In fleets that drive their tractors 120,000 to 200,000 miles a year, major overhauls every three to five years are a recurring maintenance event.īased on available data, we believe fleet owners and garages across the country do 300,000 to 400,000 major overhauls a year at an average cost of $45,000. The chassis and body of a Class 8 tractor have normal useful lives of 12 years, but the engine and transmission wear out after about 600,000 miles. The average fuel efficiency for Class 8A tractors is 6.1 mpg and the average for Class 8B tractors is 6.0 mpg. Class 8B tractors are used for dense and heavy cargo, haul 60,000 to 80,000 pounds and account for about 35% of truck traffic.Class 8A tractors are used for bulky and light cargo, haul up to 60,000 pounds and account for about 65% of truck traffic.In the US, truck manufacturers like Freightliner, International, Kenworth and Mack sell about 200,000 heavy-duty Class 8 tractors per year. There are two basic types of Class 8 tractors:
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