Based on what others have said out here (which I agree with) a new vehicle is supposed to have all fluid levels checked and topped off. That includes the DEF tank. That is part of new vehicle delivery prep which you're already paying for.
There's no way your wife used +50% of DEF merely by letting the vehicle idle and warm up. You're dealer is full of crap if he's telling you this is "normal"... he just won't admit that they "forgot" to top off the DEF tank prior to you taking delivery. Since they also sell Ram trucks there it's not like they don't know anything about diesel-equipped vehicles.
Look at it this way... if the manual says the DEF should last approximately X miles before it needs to be refilled, wouldn't it stand to reason that the time a vehicle spends idling during those X miles isn't taken into consideration?
There's no way your wife used +50% of DEF merely by letting the vehicle idle and warm up. You're dealer is full of crap if he's telling you this is "normal"... he just won't admit that they "forgot" to top off the DEF tank prior to you taking delivery. Since they also sell Ram trucks there it's not like they don't know anything about diesel-equipped vehicles.
Look at it this way... if the manual says the DEF should last approximately X miles before it needs to be refilled, wouldn't it stand to reason that the time a vehicle spends idling during those X miles isn't taken into consideration?