Yes besides with getting more than one cutting with switch grass it is more efficient unlike corn where you only get one cutting per season. Switch grass can be cut in the spring again in the summer and in the fall too. This gives a much better return on the amount of ethanol that can be produced. Plus the left overs can be burnt to help heat the process if I remember correctly.
Will grass become the new gasoline?
A new process that turns grass into biofuel has been developed by scientists. Although it might sound revolutionary, there’s still a lot to do before this becomes reality, however. Right now the amount of biofuel that can be made from grass is still limited to a few drops. But the researchers ask, will we soon be driving on "Grassoline?" Ref. Source 3a.
If I remember correctly Switchgrass is a better source of ethanol fuel than corn is. I would think that since we have ethanol plants already why not just use the switchgrass to make more ethanol. I can not see us getting a lot of fuel out of grass right now to make this all worth it.
Fewer biofuels, more green space: Climate action researcher calls for urgent shift. Growing and harvesting bioenergy crops -- corn for ethanol or trees to fuel power plants, for example -- is a poor use of land, which is a precious resource in the fight against climate change, says a researcher. Source 7o.