Use actual fill-up data
Fuel economy is more useful when calculated from distance travelled and fuel added across real fill-ups rather than dashboard estimates alone.
Make the real cost and maintenance history easier to see.
Use your own fuel, mileage, service and purchase numbers to estimate running cost, keep recurring maintenance visible and organize a used-car or trailer check before relying on memory.
Separate maintenance from prediction
A schedule can remind you what to inspect or service, but the correct interval still depends on the manufacturer, vehicle, operating conditions and service history.
Compare total ownership cost
Purchase price is only one part of the decision. Fuel, insurance, taxes, repairs, maintenance and depreciation can change which vehicle is actually cheaper to keep.
Open a tool
Choose the question you need to answer.
Vehicle tools are planning and record-keeping aids. Follow the manufacturer’s service schedule and qualified mechanical advice for maintenance or safety decisions; a calculator cannot inspect a vehicle.
Oil Change Interval Calculator
How far you can really go between oil changes, from your oil type and how the car actually gets driven — plus a log of every change and the gap between them.
Open free tool →Gas Mileage & Fuel Cost Calculator
MPG for every tank worked out from the pump, not the dash, then turned into cost per mile and cost per year. Log each fill-up and watch the average move.
Open free tool →Cost Per Mile Calculator
Fuel, insurance, repairs, payments and depreciation split into one number you can compare — against the IRS rate, the AAA average, or last month.
Open free tool →Car Maintenance Schedule Builder
Seventeen service jobs against your own odometer, with due mileages, estimated dates and anything already overdue. Log what is done and the countdowns restart.
Open free tool →Used Car Inspection & Buyer Decision Tool
Inspect every candidate against the same structured checklist, weight critical red flags, add repair estimates, compare cars, and print a negotiation sheet.
Open free tool →Trailer Roadworthiness & Maintenance Log
Inspect tires, bearings, brakes, lights, hitch and frame, flag critical failures, track due service and print a maintenance and resale record.
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