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According to this document the M3 uses 12.4 L/100km vs the Carrera which is rated at 11L/100 km, which is about 11% less than the M3. The Carrera's US mileage is rated at 18/26, so if you decrease this by 11% the M3's US figures should be 16/23.
Not great but not horrible for 420 HP.
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Driving sideways: It's not faster, but damn it's more fun!
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