Related by context. Frequent words. (Click for all words.) 66 MTBE 53 fuel additive 50 ethanol 50 additive 48 Ethanol 47 Benzene 47 corn syrup 45 biofuel 45 low sulfur diesel 45 chemical additives 45 reformulated gasoline 44 biodiesel 44 cleaner burning 44 diesel fuel 44 additives 44 trichlorethylene 44 corn ethanol 43 ethanol blended 43 benzene 43 toxic chemicals 43 renewable fuels 42 gasoline 42 hydraulic fracturing 42 solvents 42 butanol 41 sulfur 41 vinyl chloride 41 glycerin 41 pollutant 41 methanol 40 fracking 40 PFOA 40 pesticide 40 flame retardants 40 Biodiesel 40 Fracking 40 hexavalent chromium 40 glycerine 40 Aspartame 40 corn starch 40 carcinogen 40 alternative fuels 39 chemical 39 antifreeze 39 feedstock 39 acetic acid 39 chemicals 39 artificial trans fats 39 butadiene 39 preservative 39 Biofuel 39 HFCS 39 pesticides 39 groundwater contamination 39 oxygenate 39 volatile organic compounds 39 unleaded gasoline 39 propylene glycol 39 Methanol 39 refiners 39 contaminated groundwater 39 bioethanol 39 biofuels 38 Renewable Fuel 38 perchlorate 38 sulfuric acid 38 dispersants 38 toxic substances 38 Chlorine 38 cellulosic ethanol 38 unleaded fuel 38 groundwater 38 coal tar 38 sulfur dioxide 38 refrigerants 38 CFCs 38 fire retardants 38 Trans fat 38 fumigant 38 crude oil 38 diesel 38 hazardous chemicals 38 surfactants 38 syrup 37 oil 37 feedstocks 37 arsenic 37 acid rain 37 methyl bromide 37 hydrochloric acid 37 atrazine 37 propylene 37 bisphenol 37 chlorine 37 polyvinyl chloride 37 artificial sweetener 37 Clean Water Act 37 human carcinogen 37 Splenda 37 ozone depleting substances 37 Bisphenol