Acetone is a highly flammable, colorless solvent. Also known as propanone, dimethyl ketone, and other names. It is readily soluble in water, ethanol, ether, etc., and itself serves as an important solvent (actually the strongest consumer-grade solvent available to us). Its most familiar household use is as the active ingredient in nail polish remover. Also used to make plastic, fibers, drugs and other chemicals.
Acetone is a major fuel saving additive and is therefore the most important component of our fuel additive combos.