1.1 chickens per mile

ConocoPhillips and Tyson will soon begin processing animal fat into
diesel fuel right alongside crude oil.

Read about it at TreeHugger:
<a href="http://www.treehugger.com/files/2007/04/

the_schmaltzmob_1.php">The Schmaltz-Mobile Is Coming, One Chicken-
Mile At A Time</a>