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Heard At The Show: Snippets from SAE 2009 World Congress

Green Car Congress

Where does all of the energy go? In a session on total vehicle energy consumption, several people shared similar pie charts showing the flow of energy within an automobile. For every kJ of chemical energy in the fuel for a spark ignition internal combustion engine, 73 % is sacrificed to chemical and thermal losses. Breaking out the 22%, aerodynamic losses account for 39%, tire resistance is 25%, transmission and drivetrain 20%, accessories 12% and bearings 3%.