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Cake day: August 27th, 2025

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  • IIRC, the US measure how efficient an engine burn an amount of fuel, while Europe measure the emissions of the distance traveled.

    Quick and simplified example to illustrate the difference:

    US car getting 33.5mpg (7.0 l/100km) emitting 126g of CO2 per kilometer. That’s 18g of CO2 per liter of fuel.

    EU car getting 39.2mpg (6.0 l/100km) emitting 120g of CO2 per kilometer. That’s 20g of CO2 per liter of fuel.

    It’s been years since I read about this, so I can’t remember the details of how/what it’s measured.