When a used car salesman is reluctant to show you the Carfax report on a car he's trying to sell, go ahead and assume he's hiding something. These guys gave me the runaround about the Carfax when I test drove a car that looked to be an awesome deal. That should've been my first clue that their ad claiming that all their cars have clean titles might be a load of BS. Then (after a little more runaround) they gave me a "summary" of the Carfax over the phone that conveniently left out some very important information--information that would've kept me from bothering to test drive the thing if I'd had it earlier. (They get two stars rather than one for not straight-up lying to me, though I think it's a sad, sad state of affairs when that's worth two stars.) Luckily I ran my own Carfax rather than trusting them.
Again, if they're reluctant, they're probably hiding something. In this case, it was the fact that the car had been leased, then listed as a fleet vehicle, and had then gone completely off the radar for the past three years. Me: "Um, according to the Carfax report, it looks like no one owned this car for the last three years....isn't that kind of suspicious?" Them: "We think that's a mistake." Me: "But you can't tell me where it's been or what it's been used for or anything else about what's happened to it for the past three years." Them: "No." YIKES.
Hey, maybe it's a perfectly wonderful car and everyone who leased/rented/owned it on the DL treated it like it was their baby. But I'd be really effin' surprised. Run your own Carfax on any car you're serious about, especially from these guys. Sketch. Sketch,sketch,sketch.