Kenworth Truck Company has produced its latest version of a the "Push Less Air Pull More Profit" guide, emphasizing the importance of spec'ing trucks for aerodynamics and fuel economy. The newly updated, 4-page guide provides spec'ing tips, including the use of full roof and chassis fairings, side extenders, and under hood air cleaners, in addition to careful selection of wheelbase and fifth wheel setting to ensure the optimal trailer gap. Available as a .pdf file for electronic download and printing from Kenworth's home page (www.kenworth.com), the Kenworth guide also offers driver tips and proper maintenance steps to help enhance the bottom line through increased fuel economy.