Automatic start-stop systems are becoming more common on gasoline powered cars, particularly hybrid, but Audi is looking to change that with the introduction of a new system on the A3 that is paired with the 7-speed S-tronic dual clutch transmission on both their 105 hp 1.6 TDI diesel and the 125 hp 1.4 TFSI gas engine. In both cases, the cars are also equipped with brake energy regeneration which captures some energy during coast down to charge the battery. This has the effect of reducing the alternator load on the engine during acceleration.  The 1.6 TDI gets an EU combined rating of 56 mpg (U.S.) with CO₂ emissions of 109 g/km while the 1.4 TFSI is rated at 44.4 mpg (U.S.) and 124 g/km. No announcement has been made concerning this technology in the U.S., but the 2010 Audi A3 is currently available in North America with the 2.0-liter TDI diesel engine.