Reviewed by Attorney Chuck Panzarella KEY TAKEAWAYS Mileage Matters A Lot: How many miles a used car has is a HUGE factor in its price. Shady Stuff Happens: Some dealerships hide a car's true mileage to get more money. This could be illegal. "TMU" is Important: If a dealer says a car's mileage is "TMU" (True Mileage Unknown), that means they're not sure how many miles it really has. You'll have to sign a paper saying they told you. Accidents Can Mess Things Up: … [Read more...] about Uncover the Impact of Mileage on Used Car Pricing