Related by context. Frequent words. (Click for all words.) 55 hybrid powertrains 53 electrically driven 51 electrically powered 51 electric drivetrain 50 PHEVs 50 zero tailpipe emissions 49 zero emission 49 EVs 49 electric motors 49 combustion engine 48 hybrid powertrain 47 hybrid drivetrain 47 EcoBoost engines 47 electric powertrain 47 internal combustion engine 47 hybrid electric 46 Volt 46 internal combustion engines 45 hydrogen fuel 45 lithium polymer batteries 45 diesel powered 45 hydrogen powered 45 Chevrolet Volt 45 FFVs 45 lithium ion batteries 45 lithium polymer battery 45 electric propulsion 45 HEVs 45 Coda Automotive 45 electric 45 smart fortwo electric 45 electric motor 45 EfficientDynamics 45 recharging stations 44 hybrid 44 motors 44 PHEV 44 lithium ion battery 44 gearless 43 hybrids 43 Chevrolet Volt plug 43 powertrains 43 powerplants 43 e tron 43 diesel engines 43 reducing CO2 emissions 43 hydrogen 43 diesel engine 43 electric powertrains 43 battery powered 43 carbon emitting 43 powertrain components 42 wind turbines solar panels 42 flywheels 42 compressed hydrogen 42 internal combustion 42 Renault Nissan alliance 42 biomethane 42 combustion engines 42 recharging 42 sulfur fuels 42 turbocharged engines 42 turbo diesel engine 42 alternative fuels 42 Honda FCX Clarity 41 electric Nissan Leaf 41 volt outlet 41 ZENN 41 Bluetec 41 Hybrid Synergy Drive 41 hydrogen refueling 41 gas guzzlers 41 hybrid Camry 41 nonpolluting 41 Ampera 41 lithium ion 41 Transit Connect Electric 41 F3DM 41 exhaust emission 41 Renault Nissan Alliance 41 Li ion battery 41 genset 41 ForTwo 41 battery recharging 41 microturbines 41 compressed natural 41 Chevy Volt 41 NEVs 41 Camry hybrid 41 microcar 40 Enertia 40 carbon dioxide CO2 emissions 40 CTS V Coupe 40 regenerative braking 40 nickel metal hydride 40 polluting fossil fuels 40 environmentally friendly 40 Volts 40 Lithium ion 40 flex fuel 40 EN V