I like to take an active role in my finances and keep track of things to understand and improve my fiscal situation. I recently retired my Jeep TJ and calculated the cost per mile of my ownership of this vehicle. With purchase, gas, insurance, maintenance, registration etc. I ended up paying 35 cents per mile for the 5 years/50k miles that I owned it. I was quite happy as that figured out to be 20 cents cheaper than the fed government calculates the last I checked. Most of my savings were due to the fact that I do my own work and really had no major repair bills due to my fastidious nature with regular maintenance, and luck. So what do you pay per mile on your car? You basically have to add up all the costs of your car including Purchase Insurance Taxes Gas Registration Maintenance & Repair And divide by the miles driven. If you sold the car subtract the selling price from the sum of costs of course.