NOVELTY - Hydrocarbon composition comprises at least about 12% renewable components comprising butanol, where the composition is capable of being used with an elastomer, where the change in durometer hardness of the elastomer upon contact with the composition is substantially the same or less than the change in durometer hardness of the elastomer upon contact with a hydrocarbon composition comprising no more than about 10% ethanol.    USE - The hydrocarbon composition and methods are useful for comparing compatibility of butanol composition with elastomer to the compatibility of ethanol composition with the same elastomer; comparing compatibility of butanol composition with fiberglass resin or sealant to the compatibility of ethanol composition with the same fiberglass resin or sealant; comparing electrical conductivity of butanol composition to electrical conductivity of ethanol composition; comparing exhaust emission of butanol composition to exhaust emission of ethanol composition; comparing evaporative emission of butanol composition to evaporative emission of ethanol composition; and for comparing permeation emission of butanol composition to permeation emission of ethanol composition (all claimed).    ADVANTAGE - The invention provides hydrocarbon compositions comprising butanol that have substantially the same or improved performance properties than comparable hydrocarbon compositions comprising ethanol.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are:    (1) a method for comparing compatibility of a butanol composition with an elastomer to the compatibility of an ethanol composition with the same elastomer, comprising: (i) contacting a hydrocarbon composition comprising at least about 12% renewable components comprising butanol with a first sample of the elastomer for a time period of at least about one day while, separately, contacting a hydrocarbon composition comprising no more than about 10% ethanol with a second sample of the same elastomer for about the same time period; (ii) measuring a value of a physical or chemical property from the first and second samples of the elastomer following the contacting; and (iii) comparing the values from the first and second samples;    (2) a method for comparing compatibility of a butanol composition with a fiberglass resin or sealant to the compatibility of an ethanol composition with the same fiberglass resin or sealant, comprising: (i) contacting a hydrocarbon composition comprising at least about 12% renewable components comprising butanol with a first sample of the fiberglass resin or sealant for a time period of at least about one day while, separately, contacting a hydrocarbon composition comprising no more than 10% ethanol with a second sample of the same fiberglass resin or sealant for about the same time period; (ii) measuring a value of a physical or chemical property from the first and second samples of the resin or sealant following the contacting; and (iii) comparing the values from the first and second samples;    (3) a method for comparing an electrical conductivity of butanol composition to electrical conductivity of ethanol composition, comprising: (i) measuring the electrical conductivity of a hydrocarbon composition comprising at least about 12% renewable components comprising butanol; (ii) measuring the electrical conductivity of a hydrocarbon composition comprising no more than about 10% ethanol; and (iii) comparing the electrical conductivity of (i) with (ii);    (4) a method for comparing an exhaust emission of butanol composition to an exhaust emission of an ethanol composition, comprising: (i) operating a vehicle containing a hydrocarbon composition comprising at least about 12% renewable components comprising butanol in the fuel system of the vehicle; (ii) obtaining an exhaust sample from the vehicle during operation; (iii) measuring an exhaust emission from the sample; (iv) repeating steps (i) to (iii) while operating the vehicle containing a hydrocarbon composition comprising no more than about 10% ethanol in the fuel system of the vehicle; and (v) comparing the exhaust emission from the vehicle containing a hydrocarbon composition comprising at least about 12% renewable components comprising butanol with the exhaust emission from a vehicle containing a hydrocarbon composition comprising no more than about 10% ethanol;    (5) a method for comparing an evaporative emission of a butanol composition to an evaporative emission of an ethanol composition, comprising: (i) adding a hydrocarbon composition comprising at least about 12% renewable components comprising butanol to an evaporative emissions generator; (ii) heating the generator to form a volatile portion of the composition; (ii) collecting a sample from the headspace in the generator; (iii) measuring an evaporative emission from the sample; and (iv) comparing the evaporative emission of (iii) with the same evaporative emission from a hydrocarbon composition comprising no more than about 10% ethanol; and    (6) a method for comparing a permeation emission of a butanol composition to a permeation emission of an ethanol composition, comprising: (i) operating a fuel system containing a hydrocarbon composition comprising at least about 12% renewable components comprising butanol; (ii) measuring a permeation emission of the fuel system; and (iii) comparing the permeation emission of (ii) with the same permeation emission from a hydrocarbon composition comprising no more than about 10% ethanol.