Counterfeit gas gave British regulators heartburn back in 2002, according to reporting by the BBC. In the U.K., fuel that’s meant only for vehicles like tractors and other off-road vehicles is dyed red for identification and taxed at a much lower rate than regular gasoline. Crooks figured out a way to remove the dye from so-called “red diesel” and began selling the fake fuel to drivers. (Red diesel is sold in this country as a home heating oil.) One factory in Northern Ireland that “laundered” the red diesel cost the government an estimated £6 million annually in lost tax revenue.