Garbage IS used in some places, mostly burned to power steam generating plants. It's hard to think of it as a specific fuel feedstock, since "garbage" is a term that can be used to describe so many mixtures of various things (without even considering the "garbage" we see in political ads).
One of the interesting advantages of the cyanobacteria efforts is that they include efforts to create genetically modified bacteria that will generate oils from a variety of feed stocks.
Dead leaves and wood are substantively different from paper, since lots of chemicals are used when making paper, and there are 'contamination' issues about what things in paper might poison the bacteria.
Alcohol holds less energy per unit volume that diesel, kerosene, gasoline, etc. So focusing on making it is better suited to other uses of alcohol. I don't recall many stories about moonshiners running their cars and trucks on the alcohol they brewed.
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