In 2007, medium - size and heavy trucks used 34 billion gallons of diesel fuel. (scientificamerican.com)
The investigation found that a number of companies injected millions of gallons of diesel into the ground. (treehugger.com)
These vehicles consume roughly 140 Billion gallons of gasoline, 60 Billion gallons of diesel fuel, and 9 Billion gallons of ethanol every year. (green.blogs.nytimes.com)