Variability: Fuel variability is a consideration when using liquid biofuels such as pyrolysis oil, biodiesel, and BRO. This issue has improved with advancements in refining and quality control.

The $54 billion industry is counting on new markets like sustainable aviation fuel, or SAF, to boost demand at a time when the rise of electric vehicles poses an existential threat to liquid fuels ...

In short, they're liquid fuels made from renewable resources. ‘Bio’ is a prefix that makes a lot of stuff very cool: biosphere, bionic (anything), biodiversity. By the dictionary definition ...