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A rich overview of advanced gas topics in Ethereum. Starting with a high-level overview of gas and it's role in Ethereum. Quickly followed by a short background on Gas Estimation and some of the nuances/difficulties (Ex: All but 1/64 rule, gasLeft(), binary searching the VM for estimates etc). Featuring a high-level overview of some techniques developed at Truffle to significantly improve the efficiency of gas estimation (gasExactimation). The second half of the demonstration will be a workshop with hands-on examples of several techniques to optimize contracts.