Navistar's International ProStar+ features enhanced aerodynamics, numerous driver comfort features and MaxxForce 11 and MaxxForce 13 engines with the Advanced EGR 2010 emissions solution that don't require the addition of liquid area. New aerodynamic enhancements "set the standard as the industry's most aerodynamic and fuel-efficient tractor on the road," the company says. The truck has refined interior functionality that includes a very quite cab environment, re-engineered overhead console for easier reach and improved storage. There has been a 20-pound force reduction in clutch feel for better driver comfort, providing easier shifting and less fatigue. Among the many new powertrain features that improve fuel economy are a clutched air compressor, variable speed fan, low viscosity engine oil and fuel-efficient rear axle lubricant.