Related by context. Frequent words. (Click for all words.) 65 ethanol blended 63 flex fuel 60 ethanol 55 biodiesel 54 E# [004] 54 renewable fuels 53 alternative fuels 52 diesel 51 diesel engines 50 cleaner burning 49 bio diesel 49 unleaded fuel 49 octane 49 low sulfur diesel 47 cleaner fuels 47 gasoline 47 diesel fuel 46 diesels 45 Ethanol 45 mpg 45 biofuels 44 hybrids 44 tailpipe emissions 44 biofuel 44 compressed natural 44 Renewable Fuels Association 44 diesel powered 43 unleaded gasoline 43 exhaust emissions 43 cellulosic ethanol 43 unleaded petrol 42 EVs 42 internal combustion engines 42 MTBE 42 gallon 42 gas guzzlers 41 bioethanol 41 fuel additive 41 bio fuels 41 emissions 41 refiners 41 CNG 40 LPG 40 industrial hemp 40 Biodiesel 40 unleaded 39 diesel engine 39 Automakers 39 fuel 39 Fuel Economy 39 Automobile Manufacturers 39 internal combustion engine 39 mileage 39 electric hybrids 39 cylinder engines 38 hydrogen powered 38 biotech crops 38 hydrogen fuel 38 dispersant 38 diesel exhaust 38 emission reductions 38 hydrogen 38 SUVs 37 fossil fuels 37 VOCs 37 greenhouse gas emissions 37 Hybrids 37 carbon dioxide emissions 37 combustion engine 37 GMOs 37 Refineries 37 regular unleaded 36 emission 36 petrol 36 hydrogen fueling 36 cellulosic 36 soybeans 36 greenhouse gases 36 VeraSun 36 fuels 36 NOx 36 sulfur 36 feedstocks 36 greenhouse emissions 36 Emissions 36 liter 36 scrappage 36 atrazine 36 nitrogen oxide emissions 36 genetically modified foods 35 Clunkers program 35 B5 35 greenhouse gas 35 emission reduction 35 genetically modified crops 35 automakers 35 additives 35 liter diesel 35 Volt 35 Chevy Volt 35 propane