South Dakota ? A company that has been making ethanol from corn for more than 20 years says its ethanol research should allow it to squeeze 27 percent more fuel from each acre of the crop.

Poet, a privately owned ethanol producer in Sioux Falls, plans to expand its dry-mill ethanol plant in Emmetsburg, Iowa, to produce alternative fuel not only from corn kernels but also the cobs and stalks normally left behind in the fields.

Sen. Charles Grassley, R-Iowa, who toured the company’s headquarters and research lab last week, said there is only so much ethanol that can be made from corn starch.

So-called cellulosic ethanol is basically fuel made from plants or plant waste – something other than a corn kernel. Making fuel from this biomass costs about twice as much as cooking up corn-based fuel, government researchers say.