Miller Electric EnPak Air Power 40 is a truck-integrated, engine-driven air compressor and generator that integrates seamlessly into a truck’s electrical and fuel systems, the company says. Field service personnel can run air and power tools off one unit and with the truck turned off. According to Miller, the unit lowers fuel costs up to 30 percent, reduces truck engine hours up to 60 percent, lowers truck noise, and reduces exhaust fumes in the work area.