Patent ID: 7887604

Claim:
A method to improve the fuel economy of a combustion machine, comprising: 1) producing a fuel additive composition, comprising in admixture form: a) a surfactant selected from the group consisting of non-ionic, anionic, cationic, amphoteric and mixtures thereof; b) optionally, a co-surfactant selected from the group consisting of methanol, ethanol, propanol, butanol, ethylene glycol, propylene glycol, ethylene glycol n-butyl ether, dipropylene glycol methyl ether and mixtures thereof; c) optionally, kerosene; and d) water, 2) providing a liquid hydrocarbon fuel, 3) producing a fuel composition by dosing said liquid hydrocarbon fuel with from about 20 to about 500 ppm by weight of said fuel additive such that said fuel composition comprises: a) from about 11 to about 400 ppm by weight of said surfactant; b) from about 0 to about 100 ppm by weight of said co-surfactant; c) from about 0 to about 150 ppm by weight of said kerosene; and d) from about 5 to about 95 ppm by weight of said water, such that; the weight ratio of said surfactant to said water is from about 8:1 to about 0.5:1, and 4) operating said combustion machine using said fuel composition.