Currently, the only Ford car that you can buy with a start-stop feature to save fuel is the 2013 Fusion equipped with Ford's 1.6 liter EcoBoost four cylinder engine. The $295 option is said by Ford to save about $1,000 worth of gasoline over the course of five years of average driving. According to Raj Nair, Ford's global product development chief, the Dearborn, Michigan based carmaker will be offering the feature on all of it's volume vehicles and it will be "aggressive" in promoting it.
When a vehicle equipped with a start-stop system comes to a stop, based on a number of factors the engine control unit can stop the engine from running and then restart it as the driver lifts his or her foot off of the brake pedal. While the technology doesn't significantly affect cars' EPA fuel mileage ratings, leading to complaints and lobbying by automakers, start-stop systems are said to yield a real world fuel economy savings of 2 to 5 percent, with some manufacturers claiming up to a 10% reduction in fuel use, with corresponding reductions in emissions (an engine that isn't running isn't emitting anything).
from The Truth About Cars http://www.thetruthaboutcars.com
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