Patent ID: 7208022

Claim:
A fuel composition, comprising: (a) a diesel fuel; (b) ethanol; and (c) a surfactant comprising (1) a hydrocarbylphenol or derivative thereof that is a Mannich base or an alkoxylated Mannich base; (2) a reaction product of a hydrocarbyl-substituted polycarboxylic acid or anhydride and an alcohol, an amine, an amino alcohol, an epoxide, or a mixture thereof; or (3) a mixture thereof wherein the hydrocarbyl substituent of components (c)(1) and (c)(2) contains 4 to 20 carbon atoms; the ethanol comprises anhydrous ethanol containing up to about 0.1% by weight water, fuel grade ethanol containing up to 0.1% by weight water, or mixtures thereof; the diesel fuel is present at 50 to 99% by weight; the ethanol is present at 0.5 to 25% by weight; and the surfactant is present at 0.1 to 8% by weight and has a HLB value ranging from −30 to 20.