Related by context. Frequent words. (Click for all words.) 62 Hybrid Vehicle 58 eStar 57 hydrogen internal combustion 56 FCX Clarity fuel 56 Voltec 55 PHEV 55 Hydrogen Fuel Cell 55 Optima Hybrid 55 BMW ActiveHybrid X6 54 conventional internal combustion 54 H2GO TM 54 FlexFuel 54 Hybrid Vehicles 54 Azure Balance 54 Hydrogen Fuel 54 Hyundai Sonata Hybrid 54 hybrid propulsion 54 Hybrid Cars 54 Honda FCX 54 AuraGen 53 Turbocharger 53 BlueTec 53 BMW ActiveE 53 #.#L V6 #V DOHC 53 Capstone MicroTurbine 53 Odyne 53 Lithium Battery 53 #V MPFI OHV 53 Solid Oxide Fuel Cell 53 kW/# hp [002] 52 Escalade Hybrid 52 8 CYL 52 hybrid electric 52 #.#L V8 #V 52 propane autogas 52 MiEV 52 staff writer ANK 52 HYbrid4 52 #.# liter Duratorq 52 Selective Catalytic Reduction SCR 51 PACCAR MX engine 51 BMW Vision EfficientDynamics 51 Hybrid Electric 51 cleanest diesel 51 ActiveE 51 #.#L V8 #V MPFI 50 electric powertrain 50 Toyota Prius Plug 50 eAssist 50 Direct Injection 50 Polo BlueMotion 50 BMW ActiveHybrid 7 50 Prius Plug 50 Hydrogen Storage 50 hybrid powertrain 50 MBtech 50 Ultracapacitor 50 Jonway 50 Ecoboost 50 Medium Duty 50 Hybrid Concept 50 hybrid powertrains 50 Motor Assist IMA 50 ePower 49 Mercedes Benz Actros 49 Fuel Cell 49 exhaust aftertreatment 49 combustion engine 49 #.# liter Ecotec 49 Energenics 49 liter TFSI 49 Silverado Hybrid 49 Geared Turbofan engine 49 GenDrive 49 Powertrain Engineering 49 vehicles HEVs 49 BMW EfficientDynamics 49 membrane electrode assemblies 49 Lithium Ion Battery 49 Dodge Ram Heavy Duty 49 Touareg Hybrid 49 urea injection 49 V6 diesel 49 #V MPFI DOHC 49 #i Coupe 49 Fuel Cell Vehicle 49 Continuously Variable Transmission 48 #.# liter TDI 48 Multiair 48 C MAX Energi 48 Mercedes Benz Sprinter 48 CFM# engines 48 Variable Cylinder Management 48 LS #h L 48 membrane PEM fuel 48 nitrogen oxide NOx emissions 48 PowerVerde 48 Fisker Karma 48 Fuel Cell Seminar 48 Volt 48 By Anusha Shrivastava