With Associate Engineer Michael Goodman at the wheel, Fleet Owner went on Model 579 EPIQ tractor a test drive in part to learn more about how "real-world" fuel economy highway tests are being used at Peterbilt to validate efforts to develop what the OEM calls "full vehicle simulation" software, which would allow its vehicle engineers to more rapidly isolate trend data so improvements to truck and tractor designs can be made at a faster pace, while also customizing them better for specific applications.