Sounds like you may be getting a mileage discount! Depending on your vehicle, there can be a few variations on how to confirm your car mileage. But, in any case, you will want to look for the odometer.
Most newer cars have the odometer integrated into the helper screen in your instrument cluster, while older cars may have a smaller display or analog gauge.
To read your odometer on a car with a larger helper screen, scroll through the different display faces until you see ODO or miles, followed by a series of five or six numbers. These numbers are the total number of miles your car has been on the road.