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John Deere Power Systems introduced the PowerTech E off-highway diesel engines in 2007. These engines offer Tier 3 standards and four displacement options. The 6.8 liter engine has a 140- to 200-horsepower range, the 4.5 liter engine has an 85- to 140 horsepower range, the 3-liter unit offers 65 to 99 horsepower and the 2.4-liter engine offers 60 to 80 horsepower. In comparison with Tier 2 models, these units have more low-speed torque, and better fuel economy. In addition, their electronic controls enable improved cold-start performance, precise engine-speed control and torque-curve shaping.