NOVELTY - Composition comprises iso-butanol, optionally an octane improving component, and a vapor pressure adjustment component.    USE - The composition is useful for fuel blending, preferably for blending with a gasoline or blendstock for oxygenate blending (BOB), terminal blending with a gasoline or BOB and splash blending with a gasoline or BOB (all claimed).    ADVANTAGE - The composition meets or exceeds performance standards and parameters of ethanol-based fuel blends and satisfies both fuel demands and environmental concerns. The composition serves as an alternative to ethanol-containing fuel blends, since butanol has an energy content closer to that of gasoline, consumers face less of a compromise on fuel economy with butanol fuels, butanol has a low vapor pressure, so that it can be easily added to conventional gasoline and butanol can be used in higher blend concentrations than ethanol without requiring especially adapted vehicles. The composition allows: fuel producers to use the same gasoline blendstocks and subgrades for butanol blends and ethanol blends, even if the blendstocks and subgrades were formulated for ethanol blends; terminals that do not have a convenient way to handle butanol blending to still produce butanol-containing fuels; terminals to produce butanol gasoline blends using gasoline blendstocks and/or subgrades formulated for ethanol at the terminal, without any additional modifications or equipment; and allows existing ethanol production plants to retrofit the facility for the production of biobutanol, preferably in a manner that economically uses equipment that is already in place, so as to avoid costly equipment modifications or additions.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a fuel blend comprising iso-butanol, optionally the octane improving component, the vapor pressure adjustment component, and gasoline and\or gasoline blend stock, where the gasoline and\or gasoline blend stock is formulated for the addition of ethanol;    (2) producing a fuel blend comprising combining the composition and gasoline and\or gasoline blend stock; and    (3) producing the composition comprising (a) providing a butanol stream primarily including the butanol, a octane improving component stream primarily including the octane improving component and a vapor pressure adjustment component stream primarily including the vapor pressure adjustment component, (b) blending together the butanol stream with the octane improving component stream, and (c) blending together the butanol stream with the vapor pressure adjustment component stream, where the butanol stream blended with the octane improving component stream and the vapor pressure adjustment component stream forms the product stream primarily including the composition.