Tests show that some models have boosted fuel efficiency by up to 10 per cent, especially those using selective catalytic reduction technology
by MIKE MULHERN
The high-horsepower tractor you could buy in 2010 is not the same as the high-horsepower tractor you can buy in 2011. The newest tractors have to meet Interim Tier 4 emissions regulations that drastically reduce nitrogen oxides (NOx) and particulate matter (PM) coming from tractor engines of 174 horsepower or higher. As part of the bargain many of the cleaner burning engines deliver improved fuel efficiency.