Manure Manager, Mar./Apr. 2014, by Diane Mettler. http://www.mydigitalpublication.com/publication/index.php?i=0&m=1559&l=1&p=6&pre=&ver=flex

"Using their 6.2 million gallon digester, Fair Oaks Farms [Fair Oaks, IN] has converted waste into enough compressed natural gas (Cng) to run their fleet of milk trucks."