True MPG: most and 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?...
=4. Mercedes-AMG GLC 43
True MPG 25.3mpg
If you get your thrills from blasting away from traffic lights and listening to a piercing V6 soundtrack, the GLC 43 is well worth a look. It’s even practical and easy to drive when you’re in family mode. But it's never what you'd call frugal.
=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 in our True MPG test. However, of the two, it's the Porsche that offers more precise handling.
3. Mercedes S500 Cabriolet
True MPG 25.2mpg
While this version of the S-Class Cabriolet has now been superseded, the car itself remains on sale and is the best luxury drop-top you can buy.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. It benefits from a beautifully built interior which features one of the best infotainment systems out there.
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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