Miles are actual original miles. I bought it from the unified fire authority they used it very little. It was garaged its entire life. Cat c15 engine. 12 speed auto trans. Has full lockers on rear diff and wheels on both axles. Dual stacks dual horns dual fuel tanks 120 gallons each. No DEF tires are brand new virgin high end tires. 3.55 rear ends. The truck is in excellent shape and like brand new still. Call or text.