Aerodynamic trucks are a hot topic right now. Some figures suggest that proper truck aerodynamics might save as much as 15% to 20% on fuel costs. All of the major truck OEMs are now working to add more aerodynamic vehicles to their product lines, with more on the way. While the 2007 and upcoming 2010 engines are more sophisticated because of changes made to lower NOx and particulate levels, they may have gone as far as Americans can go mechanically and with the ECM to provide optimum fuel efficiency. So, finding alternative solutions to increase fuel economy is becoming more important.