True MPG: least efficient cars revealed
What Car?'s laboratory tests use a real-world driving route to show what fuel economy you can really expect. So, what are the best and worst performing cars?...
So, you've seen the most efficient cars, all of which average more than 53mpg in real-world driving conditions, but which cars use the most fuel?
Here we answer that question and see just what they do deliver if you’re driving gently and sticking to speed limits, but aren’t resorting to any unrealistically slow acceleration or special 'hypermiling' techniques.
The 10 least fuel-efficient cars tested:
10. Jaguar F-Type V6
True MPG 28.8mpg
One of the best things about the Jaguar F-Type is its V6 engine, because this makes a fantastic noise. However, it also likes a drink, returning just 28.8mpg in our True MPG test.
9. Cupra Ateca
True MPG 28.5mpg
As the first model from Seat’s freshly spun-off performance brand, the Cupra Ateca needed to be special. And sure enough it combines scintillating performance with impressive practicality while undercutting all its sports SUV rivals. Just don't expect it to be cheap to run.
8. Porsche 718 Cayman S
True MPG 28.4mpg
The latest version of Porsche's Cayman sports car swaps the flat-six engine of old for a four-cylinder unit in order to meet the emissions and fuel consumption targets demanded of it, but it's not enough to stop it appearing on this list. Fortunately, the Cayman can fall back on the fact it's one of the best handling cars on sale.
7. Mercedes S500
True MPG 26.9mpg
The S-Class has long been one of the best luxury saloon around and is extremely relaxing to drive or be driven in. However, despite featuring mild hybrid technology, the S500 version is anything but frugal.
6. Land Rover Discovery 3.0 SDV6
True MPG 26.3mpg
Large, luxurious SUVs aren't an efficient breed, but even by the standards of the class the Land Rover Discovery gulps down a lot of fuel, barely topping 26mpg.
=4. Mercedes-AMG GLC 43
=4. Porsche Macan Turbo Performance Pack
True MPG 25.3mpg
The Macan Turbo is a rival for the GLC 43, and averaged the same 25.3mpg when we put it through our True MPG test. However, it's since been given a new engine and is the more rewarding car to drive.
3. Mercedes S500 Cabriolet
True MPG 25.2mpg
A with the Macan, this version of the S-Class Cabriolet has now been superseded, but the car itself remains on sale and is the best luxury drop-top you can buy.
2. Audi SQ5
True MPG 24.6mpg
Like the rival GLC 43 and Macan Turbo, the SQ5 is as heavy on fuel as it is light on its feet – or at least it was until Audi swapped the petrol engine for a diesel. Strengths include a beautifully built interior.
1. Alfa Romeo Giulia Quadrifoglio
True MPG 23.5mpg
Like so many cars in this bottom 10, the Giulia Quadrifoglio is designed for performance rather than efficiency. Indeed, it's our reigning Performance Car of the Year, which tells you just how good it is at the things it specialises in.
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