There are so many things that go into what a dealer will take.
If it's a buy here/pay here place, they are selling financing, not cars. I doubt they would move much on price as they are looking for big fish to hook into a hefty credit contract.
If it's a more traditional/reputable (I know...) dealer, they may be more about dealing.
It also depends on condition, demand, and a host of other factors that are hard to determine from a web post.
But the general advice to look up the range the car sells and make an offer that you could live with. My time is worth something, so if we are within a couple benjamins on price, it may be time to say yes, and then make sure no extra fees get tagged on.
No matter what you offer, make sure it's an OUT THE DOOR price. I always negotiate OTD numbers so there are no extra fee add ons. It's not hard to find the tax, title and tag fees where you live, so figure them into the price.
IIRC, our tax is 6.5% on new cars and it's $193 for title and tags. So my offer is (what I want to pay, x 1.065) +$193 rounded to the nearest $50.
So, for example, if someone is advertising a car for $11k that I want to pay $10k for the car, I'll offer $10,850 OTD, making it clear that includes any fees and other add-ons. I'm writing a check for $10,850 and taking the car with tags, title, all taxes paid up, etc.
That way, if they have some $250 documentation fee, it's clear that it must be part of the $10,850 and not added to that figure.
You eliminate some of the games if you can do math and offer OTD figures.
Well, I might offer $10,350 or even $10k out the door the first go around, but I have that $10,850 as the limit I've set that I must be convinced by some fact not previously considered to exceed.