This is what I'm talking about!
Cool Planet Energy Systems First Company to Develop Carbon Negative Fuel at Projected Cost of Less Than $1.50 Per Gallon
It is produced from woody plant materials, so it doesn't compete with food. Biochar is a byproduct of the process, which can be used as a soil amendment. That's what makes it carbon negative.
It has been tested on an unmodified car with a blend of 5% of the new fuel and 95% regular gasoline with no measurable differences.
And, by the way, no government subsidies are needed....