Unleaded high-octane gasoline composition

Abstract

An unleaded high octane gasoline composition exhibiting reduced gum formation and improved air intake system and combustion chamber cleanliness is provided comprising at least (A) one reformate fraction produced by a continuous regeneration type reformer and/or (B) at least one reformate fraction produced by a fixed bed type reformer, said unleaded high octane gasoline composition satisfying the following conditions: Z=({fraction (1/100)})[Σ(ax)+({fraction (1/9)})Σ(by)]<0.010 wherein Σ(ax) is a summation of (ax) wherein (a) is content (vol %) of a fraction falling into reformate fraction A, (x) is content (vol %) of aromatic hydrocarbons having a carbon number of 11 or more in the fraction (a) and Σ(by) is a summation of (by) wherein (b) is content (vol %) of a fraction falling into reformate fraction B, (y) is content (vol %) of aromatic hydrocarbons having a carbon number of 11 or more in fraction B; the content of aromatic hydrocarbons having a carbon number of 7 to 8 being 30 vol % or more; and having a research octane number of 96.0 or more.

Dependencies are inferred from the claim text.