How do you optimize underbody aerodynamics for efficiency?

Underbody aerodynamics significantly affects Cd and lift. Optimization strategies include: Flat underbody panels covering rough components, smooth transitions from front bumper to floor, front air dam to reduce flow under vehicle, rear diffuser recovering pressure and reducing drag, wheel deflectors managing tire spray and flow, exhaust system integration without flow obstruction, and proper sealing around suspension openings. Active underbody elements can deploy at speed for improved efficiency while maintaining ground clearance at low speed. Underbody development requires balancing aero with cooling, exhaust routing, and service access.