It takes a lot of time to make fuel. It is made in what we call a refinery. We take oil from underground, and ship it to a refinery. here we put it through lots of processes that change its chemical composition.
From each of these changes we can get a different type of fuel, or we get plastics and all other sorts of cool materials.
Some fuels smell, but others we have to add the smell to it. This is also done in the refinery.