According to the appropriately named website Tree Hugger, those tiny little flags people sport on their cars during the World Cup reduce vehicle aerodynamics, causing the consumption of an extra 1.22 million litres of fuel.
Fortunately this year the English were dispensed with early and will no longer be doing this. However anyone still sporting a flag and driving at 65 MPH is burning an extra quart of fuel every hour.
A Canadian engineer, Dr. Peter Ostafichuk, told the Vancouver province that the increased drag kicks in as low as 40 km/h (25 MPH) because flags flap at that speed. "You don't have to be driving on the freeway."
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