Related by context. Frequent words. (Click for all words.) 54 hybrid electric 51 hydrogen powered 51 Hybrid Vehicle 50 Hydrogen Fuel Cell 49 PHEV 49 Honda FCX Clarity 49 hydrogen refueling 48 tailpipe emissions 48 Fuel Cell Partnership 48 hydrogen fueling 47 hydrogen fuel 47 smart fortwo electric 47 Hybrid Vehicles 47 Prius Plug 46 microcar 45 Autonet Mobile 45 eTec 45 PHEVs 45 Phoenix Motorcars 45 zero emission 45 hybrid powertrains 45 HEVs 44 hydrogen 44 FCX Clarity 44 electric propulsion 44 T3 Motion 44 Hydrogen 44 Chevrolet Volt electric 44 Renault Nissan Alliance 44 Shell Hydrogen 44 Hybrid Synergy Drive 44 Coda Automotive 43 FFVs 43 Flex Fuel 43 zero tailpipe emissions 43 vehicles 43 EfficientDynamics 43 Electric Vehicle 43 NGVs 43 compressed hydrogen 43 Civic GX 43 Shell Eco 43 V2G 43 Hybrid Electric 43 Mitsubishi i MiEV 43 EcoCAR 43 electric powertrains 43 DARPA Urban 43 ZEV 42 Chevrolet Volt 42 EV charging 42 mpg 42 Research Institute EPRI 42 Alternative Fuels 42 Chevy Volt 42 electric powertrain 42 Smart fortwo 42 Fuel Cell 42 Lithium ion 41 EcoBoost engines 41 hybrid propulsion 41 electric drivetrain 41 hybrid drivetrain 41 HEV 41 BLUETEC 41 Automotive X PRIZE 41 hybrid Prius 41 EVs 41 Azure Dynamics 41 E# ethanol 41 TARDEC 41 lithium ion 41 Clean Cities 41 electrically driven 41 Xebra 41 Escape hybrid 40 Mercury Mariner Hybrid 40 exhaust emission 40 alternative fuels 40 hybrid powertrain 40 electric Nissan Leaf 40 Volt 40 trucking fleets 40 Zero Emission 40 Dodge Sprinter 40 Toyota Prius hybrid 40 Vehicle 40 diesel powered 40 ZENN 40 MINI E 40 Mariner Hybrid 40 Smart Fortwo 40 Fuel Cells 39 smart fortwo 39 Toyota Priuses 39 Fuel Efficiency 39 Lithium Ion 39 DSRC 39 Toyota Prius 39 Sonata Hybrid 39 e tron