The Cost Of Running A Car Is Mostly Not Fuel

Fuel is the cost drivers quote when asked what a car costs, because it is paid frequently, in visible amounts, and against a price displayed on a sign. It is seldom the biggest item.

Depreciation is the largest cost and is never invoiced

A vehicle loses value continuously from the moment it is bought. That loss is a real cost, paid in full at the point of sale, but no bill for it ever arrives.

Because it is invisible month to month, it is absent from most household budgets entirely, and reappears only as surprise at the price offered when the car is sold.

The rate of loss is steepest early and flattens with age, which is the arithmetic behind the observation that buying a car a few years old changes the running cost substantially.

Fixed costs continue whether the car moves or not

Insurance, road taxes where they apply, and any finance payment are charged on time rather than on distance. A car parked for a month costs almost as much as one driven daily.

This means the cost per mile falls sharply with usage. A vehicle used lightly is expensive per journey, even though the fuel component looks small.

It also means that reducing mileage saves less than expected. Cutting distance affects only fuel and part of maintenance, leaving the majority of the cost untouched.

Maintenance is lumpy and therefore under-budgeted

Servicing, tyres, brakes and the occasional failure arrive at irregular intervals in amounts that do not resemble a monthly figure. Households experience them as unexpected events.

They are not unexpected in aggregate. Over a few years the total is fairly predictable in character even though any individual month is not, which is exactly the profile suited to an accumulating allocation.

Older vehicles trade lower depreciation for higher and less predictable maintenance, so the saving is real but the variance is greater, which matters for a household with a thin residual.

Parking, tolls and charges attach to where you drive

Urban driving carries costs that rural driving does not, including parking, congestion or emissions charges, and higher insurance pricing reflecting where the vehicle is kept overnight.

These vary widely by jurisdiction and change frequently, so the same vehicle can have materially different running costs in two places for reasons unconnected to the car itself.

They are also easy to omit from a comparison, because they appear as small individual transactions scattered across a statement rather than as a single motoring line.

The comparison that matters is total cost over the holding period

Adding purchase price minus expected resale, plus fixed costs, plus fuel and maintenance across the years the car will be kept, gives a figure that can be compared with alternatives.

Done that way, the fuel efficiency of a vehicle becomes one input among several rather than the headline, and a cheaper car with worse consumption can still cost less overall.

It also makes the option of not owning a vehicle comparable, since the alternatives are priced per journey and the ownership case is dominated by costs that accrue regardless.