In our November 2012 cover story, we looked at the fuel efficiency of the new Tier 4i-compliant row-crop tractors over 150 hp. For this latest round of testing, the Nebraska Tractor Test Lab (NTTL), the official testing lab, had to revise its testing procedures to account for the extra fuel and fluids needed to meet the mandated 90% reduction of particulate matter also known as soot, and a 50% drop in oxides of nitrogen, which forms smog....
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