Fun fact, an engine with a carburetor can very very easily run on biomass, wood or dried grass, via gasification. Essentially, a large sealed container with a fire under it, or a fuel deprived fire inside of a container, will produce a large amount of combustible gas that can be bubbled through some water to clean/cool it a bit, and then fed straight in to the carburetor. No modification to the engine required, although a bit of tuning will get better performance. It doesn’t work with a fuel injection engine unfortunately, and basically all modern cars are fuel injected. It will also have less performance than with gasoline as the gas is less energy dense.
Nighthawk in light did a video on it with a little motorized bike, his results weren’t the best as his design wasn’t great but the engine did run. There are a ton of examples of people running vehicles surprisingly well on these kinds of system though, usually older pickup trucks as the bed gives a good spot to put the gasifier.
Which contains a whole lot of carbon monoxide and polycyclic aromatic hydrocarbons. Make sure that shit is sealed well because those PAHs will give you super cancer if you breathe it in while riding your bike. And don't play with the "tar" without extensive PPE because that shit is concentrated PAH carcinogens.
Yah breathing in smoke from a fire is generally ill advised. So is huffing gasoline. Or leaving a car running in a garage.
Generally I think the sealed container with a charcoal fire compartment underneath is a better way of doing it than a partial combustion one, simply because it is much easier to seal it up properly, and you end up getting a better mix of combustibles.
Isn't that just biofuels? Vegan cars would be such an ecological disaster. Veganism is pretty green but the idea of using loads of land for car fuel rather than food would be a massive problem. Even if they did eat just grass.
In fact, if they did, would we be required to give all our lawn clippings to the council for biofuel processing? Would having a lawn go from an HOA requirement to that of a government law in America for example?