The No. 1 thing to look out for is evidence that the odometer has been tampered with to make the car appear that it has less miles on the road, Carter said.
"You're going to want to match tires to mileage," Carter said. "If you've got an odometer that says the vehicle's got 30,000 miles on it, then you should probably still have the original set of tires on that vehicle. If you don't have, then you might want to question whether the mileage on the vehicle is accurate."
Checking out the brake pedals and the rest of the interior can help determine if the car has more miles on it that advertised.
"If you've got an odometer that reads 40 or 50 thousand miles, but you see huge wear marks on a brake pedal or accelerator pedal, that's an indication that the mileage on the odometer is not accurate."
Carter said odometer tampering is less common these days, but that it is still happens more than people would think.
"You hear reports that 10 percent of the cars sold have had odometers tampered with," Carter said. "It's not as easy to do these days because you've got electronic odometers as opposed to mechanical. But those are sort of the numbers that have floated around the industry for a long time."
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