Would that have been switchgrass by any chance? I've been hearing about that lately.
The other thing that people need to know is that a gallon of ethanol does not produce the same amount of BTU's as a gallon of regular gasoline. In fact it is quite a bit less. I don't have the numbers handy, but if I remember "ballpark figures" it was about 111,000 BTU's/gal of ethanol, vs. 160,000 BTU's/gal for regular unleaded gas. Whatever the exact numbers are, the point is that it takes more ethanol to produce the same amount of work.
I did a comparison in my work truck. I ran ethanol (10%) gas for one month and tracked my milage carefully. I then ran regular unleaded for a month and compared. I got on average 2.5 mpg less with the ethanol than the regular gas. With the 34 gallon tank on my truck that works to over 80 miles less distance on a tank of gas if I use ethanol. I don't use it unless I have to.
Gasoline is about 110,000 BTUs/gallon. Number 2 fuel (30 API gravity) is about 135,000 BTUs/gallon. 10 API Number 6 fuel is 150,000 and slurry oil (Negative gravity cracked, low sulfur) is 159,000 BTUs/gallon.