Mileage tracking devices track a vehicle's mileage. A top is hingedly attached to a bottom in a “clamshell” design. The front of the top has an LCD touchscreen, and the front of the bottom has a keypad. The rear of the top has a solar panel, and the rear of the bottom has a battery compartment enclosing a rechargeable battery. One side of the bottom has a USB port, and the opposing side of the bottom has a power port that receives one end of a car charger. Voice recognition software and data are stored in memory accessed by a microprocessor. The mileage tracking device provides calculator, calendar, address book, mileage log, and car maintenance functions. The LCD touchscreen displays the current date and time and the level of charge of the rechargeable battery.