As I understand what I read the feature adds only about 4 - 5% to estimated mileage. If the feature is nonlatching so that if it is switched off it will automatically turn on again after the engine is manually shut down and later restarted, the EPA rates the vehicle's mileage as if the autostop is always used which results in higher estimated mileage than if the device is latching as the EPA rates those systems as only being used part of the time. The manufacturers may benefit from higher mileage ratings by installing nonlatching devices.
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"No one is more hated than he who speaks the truth." Plato
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