What Makes a Car Cheap to Run, and What Only Looks Cheap

Note: costs mentioned below are given in US dollars as a general point of reference — actual prices vary by country, currency, and local market.

Why purchase price is a poor proxy

A car that costs less to buy but loses value faster can cost more to own over five years than a pricier car that holds its value. Since depreciation is typically the biggest single line, a difference in resale performance swamps a difference in fuel economy for most drivers.

The four categories, and how to estimate each

Depreciation

The largest line and the hardest to guess. Work it as purchase price minus realistic resale value at the point you expect to sell. For resale, look at what the same model, of the age and mileage yours will be, is currently advertised for — that is real market evidence rather than a projection. Our depreciation calculator turns an annual rate into a value curve once you have a rate you believe.

Fuel or energy

Take the official economy or efficiency figure, apply a realistic penalty for your kind of driving, and multiply by your annual mileage and your local price. A national average mileage figure — commonly quoted around 12,000 to 15,000 miles a year — is not your mileage, and using it is the fastest way to get this line wrong. The fuel cost estimator handles the arithmetic.

Insurance

This cannot be estimated from vehicle class alone with any accuracy, because it depends on you as much as on the car — age, licence history, postcode, claims record and annual mileage. Broad class comparisons are useful only for ranking candidates against each other. For a figure you can budget against, get real quotes on your shortlist. It takes minutes and the spread between similarly priced cars is often startling.

Maintenance and repairs

Look up the manufacturer's service schedule and the published price of a service plan for the model, then add tyres at the rate the car goes through them and a realistic allowance for wear items. Cars with unusual tyre sizes, expensive brakes or long-interval-but-expensive services can cost far more than their segment suggests.

Worked example

Two cars, five years, the same driver. Car A costs $4,000 less to buy but is expected to retain a notably smaller share of its value; Car B is thirstier by a couple of miles per gallon but holds value well. Over five years and 60,000 miles, the depreciation gap comfortably exceeds the fuel gap, and Car B is the cheaper car to have owned — despite being the more expensive car to buy and the more expensive car to fuel.

Common mistakes when chasing low running costs

1. Optimising fuel economy while ignoring depreciation, which is usually several times larger.
2. Assuming a hybrid or EV always wins. It depends on the price premium, your mileage, your local fuel and electricity prices, and — for an EV — whether you can charge at home.
3. Using a national average annual mileage instead of your own, which distorts both fuel cost and depreciation.
4. Treating insurance as a fixed segment cost rather than getting quotes, when it is one of the largest and most variable lines.