| 摘要 |
The invention provides an unleaded gasoline composition comprising a major amount of hydrocarbons boiling in the range from 30 ~C to 230 ~C and 2 % to 20 % by volume, based on the gasoline composition, of diisobutylene, the gasoli ne composition having Research Octane Number (RON) in the range 91 to 101, Moto r Octane Number (MON) in the range 81.3 to 93, and relationship between RON an d MON such that(a) when 101 >= RON > 98, (57.65 + 0.35 RON) >= MON &g t; (3.2 RON- 230.2), and (b) when 98 >= RON >= 91, (57.65 + 0.35 RON) >= MON &gt ;= (0.3 RON + 54),with the proviso that the gasoline composition does not contain a MON- boosting aromatic amine optionally substituted by one or more halogen atoms and/or C1-10 hydrocarbyl groups; a process for the preparation of such a gasoline composition; and a method of operating an automobile powered by a spark-ignition engine equipped with a knock sensor, with improved power outp ut.
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