Fuel composition

摘要

An unleaded formulated motor gasoline having a MON of 80 to less than 98 comprising a base blend composition having a Motor Octane Number (MON) of at least 80 comprising: (a) at least 5% by volume of the total composition of at least one hydrocarbon having the formula R-CH2-CH(CH3)-C(CH3)2-CH3, wherein R is hydrogen or methyl, (b) at least one saturated liquid aliphatic hydrocarbon having 4 to 12 carbon atoms, and at least one motor gasoline additive selected from anti-oxidants, corrosion inhibitors, anti-icing additives, engine detergent additives, anti-static additives, metal deactivators, surface ignition inhibitors, combustion improvers, anti-valve seat recession additives and colouring agents. Also described is a method of reducing emissions of exhaust gases in the combustion of unleaded gasoline fuels of MON of at least 80 and less than 98, from cold start of a spark ignition combustion engine, which comprises having a compound of the formula R CH2 CH(CH3)-C(CH3)2-CH3, wherein R is hydrogen or methyl, present in the fuel.