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The battery save is simply a feature where if you forget to turn off like your light or such the vehicle will automaticly turn them off after a set time, somewhere around 20 minutes give or take. It regulates the amount of battery power draw which is allowed after the vehicle has been turned off.
The Excursion is built on a f-250 chassis, manufactures are not required to post any MPG information of any vehicle above that of a 1/2 ton vehicle.