Related by context. Frequent words. (Click for all words.) 72 diesel engines 71 diesel 69 diesels 68 diesel engine 60 turbodiesel 59 powerplants 59 conventionally powered 58 turbo diesel 58 hybrid electric 57 hybrid propulsion 56 cylinder diesel 56 hydrogen powered 56 V6 engines 55 electric hybrid 54 exhaust emissions 54 V8 engines 54 fleets 54 hybrid powertrain 53 compressed natural 53 flex fuel 53 zero emission 53 #.#L engine 52 internal combustion engine 52 hybrid 52 combustion engine 52 electric propulsion 52 liter turbodiesel 52 internal combustion engines 52 particulate filter 52 Hybrid Synergy Drive 51 liter diesel 51 hydrogen fuel 51 electrically powered 51 V8 powered 51 liter turbo diesel 51 FFVs 51 cleaner burning 51 diesel locomotives 51 sedans 50 #hp [002] 50 hatchbacks 50 gas guzzling 50 cc engine 50 powerplant 50 Compressed Natural Gas 50 hybrids 50 bio diesel 50 cleaner fuels 50 internal combustion 50 Nissans 50 luxury sedans 50 engined 50 PHEV 50 engines 50 electrically driven 50 HEVs 50 V6 engine 50 fleet 49 Civic Hybrid 49 Flex Fuel 49 #hp [001] 49 #.#L [001] 49 CNG 49 BlueMotion 49 hybrid Prius 49 diesel fuel 49 piston engine 49 Escape Hybrid 49 diesel particulate filter 49 powertrains 49 Ford Escape Hybrid 49 motors 49 #.#L V8 49 Smart ForTwo 48 crossover SUVs 48 MPVs 48 biodiesel blends 48 gensets 48 rotary engine 48 Crown Victorias 48 selective catalytic reduction 48 electric 48 V8 engine 48 Smart Fortwo 48 liter TDI 48 biodiesel 48 CUVs 48 naturally aspirated 48 combustion engines 48 electric motors 48 gas guzzler 48 automatic transmissions 47 Volkswagen Touareg 47 cylinder engines 47 #.# liter V8 47 LCVs 47 Mitsubishi i MiEV 47 compact sedan 47 EVs 47 #.# liter V6 47 Audi R#