Microemulsion fuel containing a hydrocarbon fraction, and ethanol, water and an additive comprising a nitrogen-containing surfactnant and a an alcohol

A composition, characterised in that it comprises a homogeneous liquid phase containing

• a) 70-95% by weight of a hydrocarbon fraction having a boiling point within the range from 130 to 425° C.,
• b) 2-25% by weight of ethanol,
• c) 0.002-1.2% by weight of water, and
• d) 0.2-25% by weight of an additive comprising
• i) 5-100% of a nitrogen-containing surfactant of the formula
• 7
• where A is an alkyleneoxy group of 2-3 carbon atoms, n is 0-4, p is a number from 2-3, m is from 0-3,
• R is an aliphatic group or an acyl group of 8-22, preferably 12-20, carbon atoms or the group R2O(A)nR3, where R2 is an aliphatic group of 8-22 carbon atoms, R3 is the group CpH2p, where p has the meaning mentioned above, or the group CH2CH(OH)CH2 and A and n have the meanings mentioned above,
• Y is an alkyl group of 1-4 carbon atoms or the group (A)nH, where A and n have the meanings mentioned above,
• B is the group →O and v is 0 or 1 provided that when v is 1 then Y cannot be hydrogen, X is the group
• 8
• where A, p and n have the meanings mentioned above and r is 0-2, with the proviso that when m is 0, r must be 0;
• the sum of all n in formula I being 0-5, and ii) 0-95% by weight of an alcohol of the formula
• ROH (II),
• where R is a hydrocarbon group having 5-24 carbon atoms.