This video was crazy, making ethanol from Corn provides something like 1% of the power of the sun hitting the square meter of farm used for it. Meanwhile using tonnes of water, space, and other things. It's basically a terrible idea over-all given alternatives like electricity and solar power.

And it mostly only works because its government subsidised.

But watch the video for the full story: Real Engineering - Why Biofuels Are Terrible https://www.youtube.com/watch?v=OpEB6hCpIGM