This Reuters story about an oil leak on the Yellowstone River contains this informative explanation of the "oil barrel." "Exxon estimated the oil release at anywhere from 750 to 1,000 barrels. One barrel of oil is equivalent to 42 gallons (163 liters), and the pipeline typically transports 40,000 barrels a day." http://news.yahoo.com/exxon-mobil-says-oil-leaked-yellowstone-river-173628110.html;_ylt=Au9bNio0cjAEh7eHaPsnPPis0NUE;_ylu=X3oDMTNhMnA5ZGNmBHBrZwNiZjZlYzhjNS0xN2YzLTMzMDctYmM0OC0zNWEyOTM3NGZlZDAEcG9zAzExBHNlYwNNZWRpYVRvcFN0b3J5BHZlcgMxMTU3MTJjMC1hNWNlLTExZTAtYjZiZi1jZGZkYjRiZjM5M2I-;_ylg=X3oDMTFpNzk0NjhtBGludGwDdXMEbGFuZwNlbi11cwRwc3RhaWQDBHBzdGNhdANob21lBHB0A3NlY3Rpb25z;_ylv=3
Unfortunately, it is just a tad under 159 L, 158.9873 L if you wish to split hairs. I could even accept 160 L as a two significant figure approximation. If you carry a third figure, it should really be the correct the third figure. There is no obvious link to complain about factual errors.
