Worst cars for fuel efficency revealed – and how owning one could cost you an extra £836 a year

YOU might have your heart set on buying a beautiful new car, but if you knew it cost £836 more to run than a similar vehicle, would you still buy it?

This is the staggering price difference between the most fuel-efficient and the least fuel-efficient cars on the market.

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of the least fuel-efficient vehicles, across four categories; city cars, small cars, medium cars and large cars.

It has also published the names of the most fuel-efficient cars on the market, but you must be a paid Which? subscriber to access this list.

The results show the stark contrast in how much fuel different cars guzzle, so it's worth a read if you're considering buying a new motor.

Which? calculated the miles per gallon on each vehicle according to the average fuel prices in 2016, when petrol cost 109.2 pence per litre and diesel cost 109.7 pence per litre. But fuel costs are rising - so drivers face even higher costs this year.

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Least fuel-efficient city car

The least fuel-efficient city car is the Vauxhall Adam Rocks, which costs £867 a year to run - £230 more than the most efficient city car on the market.

It costs around £14,137 and has a 1.4-litre engine, with 150-horsepower (hp).

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Which? rated it a lowly 60 per cent because of its high fuel costs, noise and the fact that there's no four-wheel drive.

Least fuel-efficient small car

The Renault Clio is the least fuel-efficient small car on the market; filing up costs £852 a year - £366 more than the most fuel-efficient motor on the market.

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A typical Renault Clio model costs £10,740 and has a 1.6-litre engine.

Which? rates the car just 62 per cent, in part because it's so uneconomical to run.

Least fuel-efficient medium car

The least fuel-efficient medium car on the market is the Volkswagen Beetle. The iconic motor costs just shy of £16,000, but it's annual fuel cost is a whopping £1,336 - £836 more than the most fuel-efficient car on the market.

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The beetle, with a 2.0-litre engine and 200-hp, is Volkswagen's most famous and instantly recognisable car, but it isn't cheap to run.

Least fuel-efficient large car

Finally, in the large car category, the least fuel-efficient car is tied between the Lexus RC and the BMW 4 Series Gran Coupe

Both vehicles have 2.0-litre engines and cost around £30,000. They are also expensive to run.

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Both vehicles will cost £1,531 a year to fill up - £784 a year more than the cost to fill up the most fuel-efficient car on the market.

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With fuel prices slowly rising - petrol and diesel prices rose by around 2p a litre last month taking them to their highest prices for more than two years - it is becoming pricier to own a car.

This is despite the fact that the wholesale cost of unleaded has remained the same, and the cost of diesel has gone down.

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