To save gas on Ethereum mainnet:

• Time transactions during low-activity periods (e.g., late UTC nights or weekends).
• When transferring ERC20 tokens, leave a small balance (e.g., 0.0001 tokens) to avoid higher gas costs for emptying an account.
• Monitor real-time gas prices using tools like Etherscan or ETH Gas Station, as prices fluctuate with network activity.

Current gas prices are low, but check frequently for changes.