The way you should price your car is to go to Carmax and get their 7-day written offer to buy your car. They do a whole lot more research than most people can ever do, it takes a good hour. They check all the mechanical and give it a thorough inspection, they look up black book value and also have their own market metrics for the demand for that particular model. I bet PT cruisers got the crap end of the stick haha. At the very least you got a basic inspection for free as they'll tell you if there's something majorly wrong with the car as they'll deduct that from the offer. This is the bottom end you should start your pricing. The carmax pricing is the very lowest you should take from private party, and I would actually say $500-1000 above carmax's offer is a reasonable mark for the bottom end of the pricing range when considering your price. Afterall, if you sell to carmax they do all the paperwork, you can just drop the car off, get a ride home and take a check with you the same day. No need to deal with people, deal with their loans and banks, safety, etc. So the only reason to consider selling to private party is if you can get a good premium from doing so relative to Carmax's offer.
Carmax goes off of Black book value. You're not going to get much but it's a good baseline that you can add maybe $1000 to to gauge the demand for it. The reason for this is because Carmax buys car that they not only try to sell themselves (their used car have really high standards) but the ones that don't make the cut are sold off to auctions and other used car dealers all around the country and so it's always going to be way lower than what you can truly get for your car. That's how they make money.