Converting Gallons to Liters and Liters to Gallons - YouTube
3 Ways to Convert Gallons to Liters - wikiHow
Tenaris on Twitter: "Let's do a brain exercise. Approximately how many liters are in 1 barrel of oil? Hint: 42 US gallons = 1 barrel. http://t.co/G0o2FUWd3X" / Twitter