The Cummins 2020 X15 Efficiency Series is designed for increased uptime and improved driver satisfaction. The new series offers engine hardware enhancements to provide better air handling and lower friction, delivering up to 3.5 percent fuel economy improvements to the base engine offering, the company says. It also includes an oil-drain interval of up to 75,000 miles. The new EX ratings offered in the X15 Efficiency Series deliver expanded powertrain capabilities that can deliver up to an additional 1.5 percent fuel efficiency. These ratings contain the full suite of powertrain features, including not only all prior ADEPT features, but new capabilities such as predictive gear shifting, predictive braking, on-ramp boost, and dynamic power.