DODGEVILLE, Wis. — Farmers
a century ago used a different kind
of “horsepower”in their fields, allot-
ting a certain amount of their crop
for fuel in the form of feed.
Fast-forward to modern agricul-
ture where another version of horse-
power runs on fuel that perhaps was
extracted from underground on the
other side of the world...

Illinois AgriNews September 26,2008 (PDF)