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Truffle's mainnet default is 100 GWei, which is typically 20x-100x higher than the gas price required. If the user hasn't explicitly set a gas price, use a gas price API (such as [eth gas station](https://ethgasstation.info/)) or the value from previous blocks (similar to what the [gasPrice subprovider](https://github.com/MetaMask/provider-engine/blob/master/subproviders/gasprice.js) does) to estimate a more reasonable value.
Note that newer versions of truffle/web3 **may** handle this automatically, if we upgrade.
Another possible enhancement could be to check the actual value of the tx (in either ETH or USD), and warn the user if it exceeds a certain threshold.