Power packing.

The article discusses the focus of agricultural machinery manufacturers on increasing the efficiency of their engines at current sizes in the U.S. as of March 2010. The manufacturers are focusing on horsepower and packaging to increase engine efficiency. They are said to be working on power density instead of on increasing engine size because it is easier, cheaper and more practical. The agricultural machinery makers including AGCO Corp. and Deere have increased horsepower in their tractors.