I have a Hemi and two 2.7L Chargers. All 3 consume oil like the dealer states. It is going to come down to how hard you drive your car. My Hemi is around a Qt low at change time always because I beat the tar out it. One time, it was almost 2 Qt's low at change time. That was when it was new and I just put on all the aftermarket mods. I now keep an extra bottle of oil in the garage and check it every 2 weeks, just to make sure. My Hemi is my baby.
The key phrase that the dealer is telling you that is "normal driving conditions". Everything else can take a toll on the amount of oil used. If you live in a hilly area, or a hot climate area, your engine will have to work harder to get around or keep cool, thus causing greater oil consumption. Also, even though you have the 3.5, it is probably safe to assume that you like to get on it sometimes. All this plays a factor.
If you baby it real good, not exceeding 55 mph, drive it 3000 miles over 3 months, you probably will not lose/consume any oil (this is normal driving as referenced from the dealer/mfg). But in the real word where the speed limit is for reference and daily driving can put 3000 miles on a car in a month or two, can take a toll on a car.
In the old days, this was pretty much a well known fact about cars and oil consumption. Everyone used to check their oil levels as often as they check their tire pressure. Now alot of us have gotten lazy and don't think about it. I too neglect checking sometimes.
Your car is fine. You have nothing to worry about.