How to Choose the Right Car for Your Needs

Petrol, diesel or electric? How to choose

Picking the right fuel type is the biggest single decision you will make when buying a used car. Get it wrong and you pay for it every week. Get it right and the car almost runs itself.

The used market is tilting fast. Auto Trader data for March 2026 shows the average used car selling for £17,370, with petrol cars averaging £15,022, diesel £14,649 and used electric cars £22,945. Time-to-sale has fallen to 25 days across the board.

Electric: cheap to run, slow to resell

Home charging remains the single biggest cost advantage of an EV. Charge on an overnight tariff and you can run a family EV for around 2-3p per mile, according to the RAC - roughly a fifth of the cost of a petrol equivalent.

Public rapid charging is a different story. Zapmap's 2026 tracker puts ultra-rapid public charging at 70-85p per kWh, which erases most of the saving if you cannot charge at home.

Out here in the Tyne Valley we see the rural EV problem first-hand. Plenty of Hexham properties have no off-street parking, and the nearest rapid charger can be 15 miles away. If you can plug in on your own drive, an EV works. If you cannot, be honest with yourself.

Diesel: still the motorway king

A modern Euro 6 diesel will still return 55-65mpg on a long run. If you regularly drive more than 15,000 miles a year - and especially if most of those are motorway miles - diesel is rarely a mistake.

The catch is DPF (diesel particulate filter) health. Short, stop-start commutes clog DPFs and turn a £50 service into a £1,200 bill. Diesels are for drivers who actually use them as diesels.

Petrol: the safe middle ground

For most buyers doing under 12,000 miles a year, petrol is still the lowest-stress option. Lower purchase price, simpler servicing, no DPF worries, no public-charging gamble.

RAC Fuel Watch had average UK unleaded at around 136p a litre in early March 2026, before a mid-month spike pushed it higher. It is worth checking before you buy - fuel spikes change the monthly maths more than most people realise.

What size car do you actually need?

Most drivers buy more car than they need. A bigger car does not just cost more to buy - it costs more to insure, fuel, tyre, tax and park, every week you own it.

Match the car to the job

• Single driver or couple: a supermini or small hatch (Fiesta, Polo, Corsa) is usually all you need. Cheap to insure, easy to park, good resale.
• Young family: a mid-size hatch or small estate (Focus, Golf, Octavia) will swallow a buggy and a weekly shop without the SUV tax.
• Three-plus kids or regular towing: this is where an SUV or MPV earns its keep. Otherwise you are paying for space you never use.
• High-mileage commuter: comfort beats everything - aim for a long-wheelbase saloon or estate with adaptive cruise.

Insurance - the cost people forget

According to the Association of British Insurers (ABI), the average UK comprehensive motor premium sat around £622 in early 2026. Big SUVs, modified cars and high-performance models routinely double that. Always get a quote before you buy - not after.

Our car insurance guide walks through the groups that still return sensible quotes.

Fuel economy vs body size

A modern small hatch will comfortably return 45-55mpg in mixed driving. A large SUV on the same commute often struggles to break 35mpg. Over 12,000 miles a year at 140p a litre, that 15mpg gap is roughly £700 out of your pocket.

Residual value: the quiet cost nobody talks about

Depreciation is the biggest cost of car ownership - bigger than fuel, insurance and servicing combined. Yet most buyers never plan for it.

Sub-£2,000 bangers: risky, not always cheap

Cars in the £1,000-£2,000 bracket can absolutely still earn their keep. But the margin for error is tiny. One failed clutch, one bad MOT, one rusted sill and the car is worth scrap money.

Auto Trader reports that prices for 10-15 year old used cars are up 9.7% year-on-year to £7,020 on average - partly because there are simply fewer good ones left. If you are shopping at the bottom of the market, walk away from anything without recent bills.

£3,000-£7,000: the honest sweet spot

This is where you find 5-8 year old cars from proven families - Focus, Golf, Civic, Octavia, Yaris - with sensible mileage and some service history. The MOT track record on GOV.UK is free, public, and tells you more than any dealer patter.

Lease, HP or buy outright?

Leasing (PCH) is cheapest per month for new metal but you never own anything. HP gives you ownership at the end. Buying outright avoids all interest but ties up cash.

If you are weighing finance, read our finance options guide first. And check the FCA motor finance redress scheme - if you bought on PCP or HP between April 2007 and November 2024, you may be owed an average of £829 under the FCA's £7.5bn scheme confirmed in March 2026.

When you are ready to move the old car on, our best time to sell guide walks through the month-by-month numbers.