How it works
How CarOI calculates your true cost per mile
Most drivers think their car costs the price of gas. It doesn't. CarOI tracks every recurring expense so you see the real number — the one that matters when you compare cars, plan road trips, or decide what to charge for a delivery.
What goes into the number
Fuel
Gallons × price at the pump. Logged each fill-up by voice or text.
Maintenance
Oil changes, brake pads, fluids, repairs — everything you spend keeping the car running.
Depreciation
The value your car loses per mile. Easy to ignore, but it's often the largest hidden cost of ownership.
Insurance & registration
Recurring fixed costs amortized across the miles you actually drive.
Tires
A set of tires has a finite mile budget. CarOI spreads that cost across the miles they cover.
Frequently asked questions
- What is true cost per mile?
- True cost per mile is the total amount it costs to drive one mile when you account for every recurring expense — fuel, maintenance, depreciation, insurance, registration, and tire wear — not just the gas you put in the tank.
- Do I need to create an account?
- No. CarOI works without a signup. Your data stays on your device so you can start logging trips immediately.
- Can I log entries on desktop?
- Yes. CarOI supports both voice input (great for hands-free logging in the car) and text input (ideal for desktop or public places).
Ready to see your real number?
No signup. Log your first trip by voice or text in seconds.
Open CarOI