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German automaker Audi has launched a revised version of its A1 1.6 TDI with CO2 emissions of 99 grams per kilometer. Its 104-horsepower 1.6-liter diesel-burning engine, which is mated to a five-speed manual transmission, has undergone a slew of revisions that help slash the A1's CO2 emissions from 105 g/km down to just 99 g/km, meaning that this vehicle is now exempt from London's congestion charge.