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BMW claims that that the start-stop scheme reduces the normal fuel depletion and CO2 levels of the BMW M3 by up to 8 per coin or 24 grams of CO2 per klick.
As an example, the Bavarian manufacturer said that both the M3 Coupe and Litter with 7-speed M dual treadle sending now achieves an come hydrocarbon usance on the EU test bike of 25.2mpg, and 22.8 mpg with the 6-speed drill shell.