FuelSaving Mazda iStop Stalled In US Because Of EPA Tests

Over several years, Mazda's i-Stop engine start-stop feature has helped owners in other markets to save on their fuel budget�and it's helped commuters in some of the most traffic-clogged areas be a little greener.

Source:
http://www.greencarreports.com/news/1064470_fuel-saving-mazda-i-stop-stalled-in-u-s-because-of-epa-tests