So many choices for gasoline.

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 “Corn ethanol is not a climate-friendly fuel,” said Dr. Tyler Lark, assistant scientist at University of Wisconsin-Madison Center for Sustainability and the Global Environment and lead author of the study.


The research, which was funded in part by the National Wildlife Federation and U.S. Department of Energy, found that ethanol is likely at least 24% more carbon-intensive than gasoline due to emissions resulting from land use changes to grow corn, along with processing and combustion.

I've always thought ethanol was not kind to the planet because of all the diesel fuel and chemicals needed to produce the crop and refine ethanol.
In hilly southern Iowa a lot of grassland was changed to crop ground when ethanol got big.
This added to water pollution problems from the added soil and chemical runoff. There's also less wildlife habitat.

If your rewind the clock to 2000, the idea was to transition to crops likes like switch grass to be source material.  But, when crop prices drop, just like they currently have, ethanol becomes a buffer market for the corn growers.  However, Corn requires lots of water and nitrogen, challenging aquafers with high withdrawal rates and surface runoff.  IIRC, Kansas is having some aquafer depletion issues.

But, in the big scheme of things, highway gasoline sales peaked in 2004~2006 and have gradually declined since that time.  However, highway diesel sales have continued to rise.  So, the refiners don't want to blend, but the farmers want the market to stabilize crop prices.  

Honestly, it'll stay that way until the farmers decide to plant solar panels or wind turbines to make their money.