Running a car in the UK in 2026 is not cheap. Fuel, insurance, servicing, tax, parking and repairs can all add up quickly, especially when prices rise unexpectedly.
However, many motorists spend more than they need to because of avoidable habits, missed deadlines or poor planning. By understanding the most common money-draining mistakes, drivers can make smarter choices and better control their motoring costs. So, let’s take a look at what you could be doing wrong, and how you can fix it to save some dosh:
Ignoring regular maintenance
One of the most expensive mistakes is putting off routine maintenance. Skipping oil changes, ignoring worn tyres or delaying brake checks may save money in the short term, but it can lead to much larger repair bills later. A poorly maintained engine can use more fuel, perform less efficiently and become more likely to fail – costing you a huge amount in the long term. It’s relatively simple to make basic maintenance checks. If you know that you’re not the car maintenance type, you may be better off looking for affordable car leasing options (as the vendor will then be responsible for the maintenance).
Simple checks and routines that can make a difference include:
- Monitoring tyre pressure
- Topping up fluids
- Replacing windscreen wipers
- Booking services on time
Driving with underinflated tyres
Tyres are often overlooked, but they have a big and direct impact on fuel economy and safety. Underinflated tyres create more rolling resistance, which means the engine has to work harder and use more fuel. They also wear unevenly, reducing their lifespan and increasing the chance of needing replacements sooner than expected.
Motorists should check tyre pressures at least once a month and before long journeys. The correct pressure can usually be found in the vehicle handbook, inside the fuel filler cap or on the driver’s door frame. Keeping tyres properly inflated is a quick, free habit that can save money throughout the year.
Letting insurance renew automatically
Allowing car insurance to renew without checking the market can be a costly error. Although insurers are no longer allowed to charge existing customers more than new ones for the same policy, prices can still vary widely between providers. Drivers who simply accept their renewal quote may miss out on better deals.
It is sensible to compare quotes around three to four weeks before the renewal date, when prices are often more competitive. Motorists should also check whether their mileage, job title, parking arrangements or named drivers have changed, as these details can affect the premium.
Paying for unnecessary extras
Car-related costs often creep up because of optional extras that drivers do not really need. Breakdown cover, extended warranties, tyre insurance, paint protection and add-ons to finance agreements can all increase monthly payments. Some products may be useful, but others provide poor value depending on the driver’s circumstances.
Before agreeing to extras, motorists should read the small print and consider whether they already have similar cover elsewhere. For example, breakdown assistance may be included with a packaged bank account, or legal cover may already be part of an insurance policy.
Ignoring fuel efficiency
Poor driving habits can waste a surprising amount of fuel. Harsh acceleration, late braking, speeding and carrying unnecessary weight all increase consumption. Roof boxes and racks also create drag, which can make a car less efficient, particularly on motorways.
Smoother driving is better for both fuel economy and wear and tear. Accelerating gently, anticipating traffic, using cruise control where appropriate and removing heavy items from the boot can all help reduce costs. Even small improvements in miles per gallon can add up over thousands of miles.
Missing MOT and tax deadlines
Forgetting an MOT or vehicle tax deadline can result in fines and inconvenience. Driving without a valid MOT is illegal unless travelling to a pre-booked test, and it can also invalidate insurance. If a car fails its MOT, urgent repairs may be needed before it can be driven again.
Drivers should set calendar reminders well in advance. An MOT can be carried out up to one month minus one day before the current certificate expires, while keeping the same renewal date. Planning ahead gives motorists time to fix problems and avoid last-minute costs.
Choosing the wrong car
Buying a car that does not match real-life needs is another common financial mistake. A large SUV may look appealing, but it could be expensive to insure, fuel and maintain. Similarly, an older bargain may come with hidden repair costs that wipe out any initial savings.
Before choosing a vehicle, drivers should consider total running costs, not just the purchase price. Insurance group, fuel economy, road tax, servicing costs and depreciation all matter. The cheapest car to buy is not always the cheapest car to own.
Avoiding costly habits
Most motoring expenses cannot be avoided completely, but many can be reduced with better planning. Regular maintenance, careful insurance comparisons, efficient driving and realistic vehicle choices all help protect drivers from unnecessary spending. By avoiding these common mistakes, motorists can keep more money in their pockets while staying safer and better prepared on the road.
