How to calculate the “Txn Savings Fees” of an ethereum txn?

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When I view the details of a transact record on etherscan, I notice the Txn Savings Fees, any one know how to calculate it? submitted by /u/BreadIntelligent4598 |

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When I view the details of a transact record on etherscan, I notice the Txn Savings Fees, any one know how to calculate it? submitted by /u/BreadIntelligent4598 |