Buying More Car Than You Need

As soon as gas prices dropped from their spike in 2008, Americans went back to buying large vehicles. Hey — it's their prerogative. But those looking for ways to save in these lean times might do so on their next car purchase by being honest about what they really need. "If you end up buying a V8-powered pickup truck when all you need is a 4-cylinder commuter car, well, you are your own worst enemy in that case," says James Bell, executive market analyst for Kelley Blue Book's KBB.com.

Read:  Powerfully Efficient

Saying Up Front That You Want to Pay Cash

Telling a salesperson right off the bat that you intend to pay in cash might seem like a power play, but it is usually not. Doing so tips them off that they will not be making any money on you in the loan department, and this could make them less willing to negotiate the price of the car as they seek to maximize their profit. There is nothing wrong with that; dealers need to turn a profit to stay in business. Witten says that to get the best deal, first negotiate the final price of the car, and then tell them you will pay in cash.

Bing: Paying Cash For a Car

Being Clueless About Financing

Consumers haggle hard for several hundred dollars on the price of a car, but can lose thousands in the financing office without even knowing it. That's because the loans that dealers offer through partnerships with banks might not have the most competitive interest rates. "Dealers get paid back from those finance institutions for every loan they make," Witten says. "They're not really out to rip people off, but they definitely have their best interests in mind." Learn your credit score and find out from several banks or credit unions what kind of rates you can get on a car loan before you go to the dealer. Then you'll know if the financing terms that the dealer offers are worth taking, or whether to fall back on another loan.

Read:  Car Buyer's Checklist

Negotiating Down from the Sticker Price

"The price on the window sticker is all you have to work with if you didn't do your homework," says Consumer Reports' Bartlett. That puts you at a huge disadvantage. Before you set foot in a dealership, go online and research the prices of vehicles you're considering. Not just the manufacturer's suggested retail price (MSRP), but the invoice price, which is what the dealer pays for each car. Also look up consumer rebates, direct-to-dealer incentives and dealer holdbacks, which are a percentage of the invoice price that dealers sometimes get back from the manufacturer. "When you have all of those numbers, it gives you a figure to move up from, rather than down from the MSRP," Bartlett says. The goal is to aim for the best price possible while still allowing a fair profit for the dealer.

Read:  MSN Autos Top Value Picks

Fumbling on the Trade-In

In the same vein, it behooves buyers to negotiate the value of a trade-in as a separate step in the car-buying process, independent of negotiating the price of the car being bought. If discussion of a trade-in gets thrown into the mix from the get-go, the dealer can use that information to adjust the final price more to his liking than yours. The first step is to understand the value of your trade-in before you go to the dealership by looking it up on websites such as MSN Autos or KBB.com. Once at the dealer, negotiate the trade-in only after you have settled on the price of the new car. If a dealer asks upfront about a trade-in, focus his attention back on the process at hand, whether that is selecting the car or negotiating its price.

Bing: Trade-In Values

Matthew de Paula wanted to be an automotive journalist ever since reading his first car magazine in grade school. After a brief stint writing about finance, he helped launch ForbesAutos.com and became the site's editor in 2006. Matthew now freelances for various outlets.