Related by context. Frequent words. (Click for all words.) 85 diesel engine 80 diesels 72 diesel powered 72 diesel 66 cylinder diesel 62 engines 62 powertrains 61 powerplants 60 exhaust emissions 60 cylinder engines 59 turbo diesel 59 internal combustion engines 57 automatic transmissions 57 liter diesel 57 internal combustion engine 57 fuel injectors 57 cleaner fuels 56 selective catalytic reduction 56 powertrain 56 V6 engine 56 combustion engines 55 #.#L [001] 55 motors 55 manual transmissions 55 #hp [002] 55 internal combustion 54 electric propulsion 54 electric motors 54 diesel locomotives 54 turbocharging 54 combustion engine 54 cylinder engine 53 V8 engines 53 boilers 53 Diesels 53 turbine engines 53 turbocharger 53 #hp [001] 53 engine 53 cleaner burning 53 hybrid powertrain 52 gearboxes 52 particulate emissions 52 alternators 52 powerplant 52 NOx emissions 52 hybrid electric 52 hybrids 51 V8 engine 51 drivetrain 51 ethanol blends 51 electric hybrid 51 locomotives 51 #.# liter V6 51 biodiesel 50 rotary engine 50 naturally aspirated 50 diesel fuel 50 turbochargers 50 hatchbacks 50 vehicles 50 hp 50 compressed natural 50 #.# liter V8 50 sedans 50 driveability 49 low sulfur diesel 49 electric hybrids 49 emission 49 fleets 49 Diesel 49 diesel exhaust 49 combustion 49 flex fuel 49 automobiles 49 drivability 48 alternative fuels 48 Volvo Trucks 48 bio diesel 48 NOx 48 V6 48 zero emission 48 electric motor 48 #.# liter inline 48 steam turbines 48 MPVs 48 turbos 48 horsepower 48 compressors 48 Wärtsilä 48 Clean Diesel 47 outboard motors 47 luxury sedans 47 Engines 47 SUVs 47 hydrogen powered 47 EVs 47 manual gearbox 47 Hybrids 47 liter V 47 automatic transmission