; (C) power electronics; (D) vehicle, component, and subsystem manufacturing technologies and processes; (E) engine efficiency and combustion optimization; (F) waste heat recovery; (G) transmission and drivetrains; (H) hydrogen vehicle technologies, including fuel cells and internal combustion engines, and hydrogen infrastructure, including hydrogen energy storage to enable renewables and provide hydrogen for fuel and power; (I) natural gas vehicle technologies; (J) aerodynamics, rolling resistance (including tires and wheel assemblies), and accessory power loads of vehicles and associated equipment; (K) vehicle weight reduction, including lightweighting materials and the development of manufacturing processes to fabricate, assemble, and use dissimilar materials; (L) friction and wear reduction; (M) engine and component durability; (N) innovative propulsion systems; (O) advanced boosting systems; (P) hydraulic hybrid technologies; (Q) engine compatibility with and optimization for a variety of transportation fuels including natural gas and other liquid and gaseous fuels; (R) predictive engineering, modeling, and simulation of vehicle and transportation systems; (S) refueling and charging infrastructure for alternative fueled and electric or plug-in electric hybrid vehicles, including the unique challenges facing rural areas; (T) gaseous fuels storage systems and system integration and optimization; (U) sensing, communications, and actuation technologies for vehicle, electrical grid, and infrastructure; (V) efficient use, substitution, and recycling of potentially critical materials in vehicles, including rare earth elements and precious metals, at risk of supply disruption; (W) aftertreatment technologies; (X) thermal management of battery systems; (Y) retrofitting advanced vehicle technologies to existing vehicles; (Z) development of common standards, specifications, and architectures for both transportation and stationary battery applications; (AA) advanced internal combustion engines; (BB) mild hybrid