Coordinated electric vehicle (EV) charging can improve alignment between transportation operations and power-system conditions as electrification expands. This study develops an integrated simulation-optimization framework that embeds demand-aware charging (DAC) and grid-responsive charging, including unidirectional smart charging (V1G) and vehicle-to-grid (V2G), within an agent-based model, enabling dynamic feedback between optimized vehicle (dis)charging decisions and evolving transportation-system states. Using the Austin 6-county region, the framework evaluates 15,000 shared autonomous electric vehicles (SAEVs) under DAC, V1G, fleet-only V2G, and combined fleet-plus-household V2G. Results show coordinated strategies concentrate charging toward midday and provide selective evening discharge while maintaining service performance. Under favorable pricing, V2G reduces net CO2 emissions from 45 kg/SAEV/day under DAC to below 40 kg and lowers emission intensity by up to 14% to 0.14 kg per vehicle-mile traveled. DAC and V1G offer near-term options, whereas high V2G costs may hinder adoption. Realized benefits depend on tariffs, vehicle availability, and V2G maturity.

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