Related by context. Frequent words. (Click for all words.) 56 PHEV 53 electric powertrain 53 Volt 52 hybrid powertrain 52 Aptera 50 Tesla 50 ZENN 49 Electric Vehicle 49 electric propulsion 48 Fisker Karma 48 EVs 48 internal combustion engine 48 hybrid electric 48 Lotus Engineering 48 Fuel Economy 48 ECD Ovonics 48 Cobasys 48 PHEVs 48 Chevy Volt 47 Escape Hybrid 47 electrically driven 47 combustion engine 47 Fusion Hybrid 47 zero emission 47 PZEV 47 NHTSA 46 internal combustion engines 46 TARDEC 46 A#Systems 46 Chevrolet Volt 46 MINI E 46 Tesla Roadster 46 Brammo 46 Tesla Motors 46 LS9 46 NextEnergy 45 Electrovaya 45 EN V 45 powertrain 45 Zenn 45 Clean Diesel 45 HEVs 45 ultracapacitors 45 rotary engine 45 Ener1 45 Fisker 45 Rinspeed 45 Altairnano 44 Airbiquity 44 internal combustion 44 tailpipe emissions 44 Zero Motorcycles 44 diesel engine 44 electric motor 44 EPRI 44 Lithium ion battery 44 EcoBoost 44 Vectrix 44 Fuel Efficiency 44 powertrains 44 hybrids 44 EEStor 44 Coulomb Technologies 44 Renault Nissan Alliance 43 hybrid propulsion 43 EVI 43 hydrogen powered 43 Smart Fortwo 43 Enova 43 Autonet Mobile 43 Hybrid 43 CAFE standards 43 Raser Technologies 43 Proterra 43 Fisker Automotive 43 REVA 43 ECOtality 43 HEV 42 Webasto 42 EcoBoost engine 42 ARPA E 42 Hybrid Synergy Drive 42 Networkfleet 42 FCX Clarity 42 alternative fuels 42 CTS V 42 BlueFire 42 Civic Hybrid 42 Coulomb 42 i MiEV 42 BlueMotion 42 hydrogen fuel 42 drivetrain 42 Flex Fuel 42 ZAP 42 NAIAS 42 Balqon Corporation 42 Li ion batteries 42 SAE International 42 turbo diesel 42 Chevrolet Volt plug