1) "Hexane is an alkane hydrocarbon with the chemical formula CH3(CH2)4CH3. The "hex" prefix refers to its six carbons, while the "ane" ending indicates that its carbons are connected by single bonds. Hexane isomers are largely unreactive, and are frequently used as an inert solvent in organic reactions because they are very non-polar. They are also common constituents of gasoline and glues used for shoes, leather products and roofing. Additionally, it is used in solvents to extract oils for cooking and as a cleansing agent for shoe, furniture and textile manufacturing." Source and further information: http://en.wikipedia.org/wiki/Hexane 2) "Gasoline is produced in oil refineries. Material that is separated from crude oil via distillation, called virgin or straight-run gasoline, does not meet the required specifications for modern engines (in particular octane rating; see below), but will form part of the blend." "The bulk of a typical gasoline consists of hydrocarbons with between 5 and 12 carbon atoms per molecule. Many of these hydrocarbons are considered hazardous substances and are regulated in the United States by Occupational Safety and Health Administration. The Material Safety Data Sheet for unleaded gasoline shows at least fifteen hazardous chemicals occurring in various amounts. These include benzene (up to 5% by volume), toluene (up to 35% by volume), naphthalene (up to 1% by volume), trimethylbenzene (up to 7% by volume), MTBE (up to 18% by volume) and about 10 others.[6] The various refinery streams blended together to make gasoline all have different characteristics. Some important streams are: [...] Isomerate (various names) which is obtained by isomerising the pentane and hexane in light virgin naphthas to yield their higher octane isomers." Source and further information: http://en.wikipedia.org/wiki/Gasoline Further information: http://firstfuelbank.com/msds/Tesoro.pdf As a conclusion, gasoline *may* contain hexane. 3) "Since gasoline contains hexane, almost everyone is exposed to small amounts of hexane in the air. The hexane in gasoline is released into the air at service stations and in automobile exhaust. Some people may also be exposed by spilling gasoline on their skin. The concentration of hexane in the air in Chicago was recently measured and contained 2 parts hexane per billion parts air (2 ppb)." Source: http://www.eco-usa.net/toxics/hexane.shtml 4) "Several consumer products contain n-hexane. For example, gasoline contains about 1–3% n-hexane." Source: http://www.atsdr.cdc.gov/toxprofiles/phs113.html 5) "Fuels made from petroleum contain n-hexane. Modern blends of US gasoline contain about 3% n-hexane." Source: http://hazmap.nlm.nih.gov/cgi-bin/hazmap_generic?tbl=TblAgents&id=105