Not sure if it's the same for vehicles, but for a lot of used home items, when it comes to selling, fast and fair price are mostly incompatible.
If you go with Facebook marketplace and get a dozen messages overnight asking 'is this item still for sale', don't be fooled, most are probably tyre kickers. It's unbelievable how many messages you get that never even reply. If no messages jump straight to when can I view, or making an offer, consider lowering the price. The earlier advice about taking the dealership midpoint buy/sell price, sounds spot on as a starting price.