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- Fuel switching
- Environmental aspects 4
- Alternate fuels 2
- Automobile industry and trade 2
- Automobiles 2
- Buses 2
- Compressed natural gas 2
- Dynamics 2
- Energy conservation 2
- Energy consumption 2
- Factories 2
- Fuel systems 2
- Gas industry 2
- Internal combustion engines 2
- Liquefied natural gas 2
- Power trains 2
- Safety measures 2
- Spark ignition engines 2
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