Do I sound a little cynical? I just watched Condit lie and lie and lie for months.
The lie about the car was incredibly stupid, and why? He obviously had a reason he didn't want anybody to know he owned a car in DC. What could that be. What it couldn't be is anything good!
No freaking way was she jogging/running to there from Dupont Circle. She might have started running back, upset after Condomdidit told her, Hey babe, take a walk on the wild site, I was only kidding about leaving Thumbelina. Which isn't implausible considering the timing - Moongirl was going out of town, Gary, seeing she was all too serious, decided it was a good time to dump her.
But no runner/jogger who owns a pair of running sneakers will go out running/jogging in tennies, and wearing a backpack to boot. The red sedan took her there, or perhaps (more likely, considering she was consulting an online map) a taxicab driven by somebody who for whatever reason will not come forward (he be da killah hisself?)