^^Would you risk a long trip with a just kidnapped girl?
He wouldnt of killed her in the van, so taking a long trip would seem foolish...
While chances are very likely that she is somewhere closeby, I also think its plausible that has she been taken some distance (a couple hours away), Here is why: The perp would know that LE would probably be on the scene very quickly, so he might be racing to get out of the area as quickly as possible. He may have already planned an offsite location. And, he would know that the local community and LE would be scouring the local area very carefully, so maybe he has taken her far away from all of this (a hotel, a cabin, park); maybe he lives out of state or the city, passed by there and saw her and planned to come back...I wonder if he would've called to see if she was working (I'm sure LE is scouring all phone calls made to the store; a blocked call could be telling...) Also, if his heart was racing or he was nervous, he might wait a while before stopping the vehicle until he is calmer, feels that all is clear, and the adrenaline of the escape subsides. Also, we don't know under what conditions Jessica was being restrained...Had she been stun gunned (how long does it take to recover from that), was their duct tape, zip ties, rope, chloroform (how long does it take to wake up from that), was she injured, bleeding...if she was a scrapper, maybe he was injured...(we still don't know the results of the testing of the possible blood spots which is very important)...if he was going to transfer her from the vehicle to another location, under what means would he do this...with it being late at night and dark it would be able to do this without arousing suspicion...(ARS got Jessica Ridgeway into his house in broad daylight)...so many maybes...so many questions...
I wish I had more facts to create a possible awareness space and psychological profile.
Also, if I knew exactly how he got her in the van, that would help some things...