Congresses Alternate fuels Internal combustion engines, Spark ignition Compressed natural gas Internal combustion engines Air quality management Automobiles Computer simulation--Congresses Data processing--Congresses Design and construction Diesel fuels Diesel fuels--Congresses Diesel motor Diesel motor exhaust gas Environmental aspects Exhaust gas Gas as fuel Gasoline Liquefied petroleum gas Liquified petroleum gas Motor fuels Motor vehicles Motors Pollution control devices Testing