Related by context. Frequent words. (Click for all words.) 55 alternative fuels 55 NGVs 54 Flex Fuel 54 E# ethanol 52 flex fuel 52 FFVs 51 compressed natural 51 diesel 51 Clean Cities 51 biodiesel 51 renewable fuels 50 Compressed Natural Gas 50 Alternative Fuel 50 Alternative Fuels 50 diesel powered 49 diesel fuel 48 soy biodiesel 48 biodiesel blends 48 CNG 48 ethanol blends 48 hybrid electric 48 bio diesel 47 Diesel Fuel 47 E# pumps 47 E# blend 47 cleaner burning 47 ethanol blended 46 Fuel Efficiency 46 blender pumps 46 biomethane 46 microturbine 45 PHEVs 45 cleaner fuels 45 Bio Diesel 45 low sulfur diesel 45 fleets 45 compressed hydrogen 45 Clean Fuels 45 ULSD 44 biofuel 44 trucking fleets 44 IdleAire 44 PHEV 44 gasohol 44 HEVs 43 ethanol 43 fuel 43 Fuel Economy 43 biorefineries 43 liquid fuels 43 hydrogen 43 biofuels 43 hydrogen powered 43 corn ethanol 43 gasoline 43 TARDEC 43 electric hybrid 43 electric drivetrain 42 hydrogen fuel 42 Greenhouse Gas 42 internal combustion engines 42 Hydrogen 42 nitrogen oxide NOx 42 diesel engines 42 FFV 42 Hybrid Synergy Drive 42 Electric Vehicle 42 isobutanol 42 retrofits 41 environmentally friendly 41 SmartWay 41 BioFuels 41 fossil fuel 41 Renewable Fuel 41 NOx reduction 41 V2G 41 fuels 41 fossil fuels 41 E# [004] 41 Pickens Plan 41 microturbines 41 vehicles 41 bio fuels 41 Ford Escape Hybrid 41 diesels 41 Civic GX 41 greenhouse gas emitting 41 Biodiesel 41 hybrid 41 Ethanol 40 ECUs 40 vanpool 40 LCFS 40 hydrogen fueling 40 Ford Crown Victorias 40 smog forming emissions 40 anaerobic digesters 40 Renewable Fuels Standard 40 Rideshare 40 renewable energy 40 AdBlue