Related by context. Frequent words. (Click for all words.) 62 Hydrogen Fuel Cell 61 conventional internal combustion 60 hybrid electric 59 PHEV 59 Fuel Cell Vehicle 59 cleanest diesel 58 BMW ActiveE 58 Hybrid Vehicle 58 F CELL 58 FlexFuel 58 BlueTec 57 hybrid propulsion 57 electric powertrain 57 hybrid powertrains 57 AuraGen 56 PEM fuel 56 hybrid drivetrain 56 propane autogas 56 electric drivetrain 56 #.#L V8 #V 56 hydrogen powered 55 CALSTART 55 FCVs 55 hybrid powertrain 55 BLUETEC 55 Hybrid Synergy Drive 55 HYbrid4 55 urea injection 55 BlueTEC 55 C MAX Energi 54 FreedomCAR 54 EcoMotors 54 Audi TDI 54 membrane PEM fuel 54 membrane electrode assemblies 54 eStar 54 Lotus Engineering 54 Honda FCX 54 Capstone MicroTurbine 54 GenDrive 54 aftertreatment 54 proton exchange 54 Hybrid Concept 54 Selective Catalytic Reduction SCR 54 BMW EfficientDynamics 54 efficient powertrains 54 Chevrolet Tahoe Hybrid 54 Hybrid Electric 53 microturbine 53 CleanFUEL USA 53 TARDEC 53 hydrogen fuel 53 Theta II 53 EcoBoost engines 53 ActiveE 53 #.#L I4 #V DOHC 53 BlueEFFICIENCY 53 HEV 53 bi turbo 53 Turbo Diesel 53 Fiat Powertrain Technologies 52 electric powertrains 52 UTC Power 52 Le Mans Prototype 52 electric propulsion 52 CNG compressed natural 52 Efficient Dynamics 52 #.#L diesel 52 GenSys 52 SmartGauge 52 H2GO TM 52 ACERT 52 electrically driven 52 cell SOFC 52 E CELL 52 Freightliner Custom Chassis 52 BEVs 52 Engine Alliance GP# 52 SOFC 52 electromobility 52 PW#G engine 52 Super Ultra Low 52 #.#L V8 #V MPFI 52 Hydrogen Storage 52 Internal Combustion Engine 52 cellulose ethanol 51 HEVs 51 ECD Ovonics 51 AFS Trinity 51 dSPACE 51 Challenge Bibendum 51 BMW Vision EfficientDynamics 51 8 CYL 51 electrolyser 51 hydrogen refueling 51 diesel particulate filter 51 Honda FCX Clarity 51 Hydrogen Fuel 51 HUMMER H3 51 contracting activity W#HZV 51 Minotaur IV