Crop ethanol uses an extremely large amount of land for the energy. US corn ethanol uses about 2 acres to support one car. And this has a large fossil fuel inpu

Crop ethanol uses an extremely large amount of land for the energy. US corn ethanol uses about 2 acres to support one car. And this has a large fossil fuel input (possibly with a net carbon output depending on fertilizer use and how it's distilled). For a rough efficiency comparison, if there were some hypothetical 80% efficient solar panel and annual storage wasn't a concern, it could power the car with just the sunlight that hit it.