Biomass conversion was experimented with large scale by a company in Brazil, but they folded. It is a viable source of a fuel, requiring engine conversion. Petrol engines are much less flexible about what they will run on than diesel engines -- a trade off for their speedier response and high energy-density of gasoline. But they do make such conversion kits. I am not sure how much biomass you would need to make a gallon such fuel, but I am sure the data is out there somewhere.

A