I bought and later sold the same car on Ebay. For reference, a 89 Subaru XT6. Not a common car. And the Miata I'm driving I bought via Ebay. When I go to sell it I may try it through Ebay. I'll probably try cars.com when I list my RX-8. The nice thing about Ebay is the wide audience. Don't take this wrong, but the more common the car, the less helpful I think Ebay is. But if you choose the auction mode, be sure to set either the opening bid or the reserve at a level where you'd be okay with getting that price. And disclose any problems and provide several good pictures. I'd go with a few good pics in the listing and offer to send serious bidders additional pics. If you're on cars.com I'd suggest just being patient.

2001 Classic Red Mazda Miata (+/- 30MPG)
1998 Toyota Sienna (+/- 23MPG)