Real-world MPG: coupes that beat 40mpg

  • The five two-door coupes that beat 40mpg in our tests
  • One petrol, four diesels; BMW 420d beats 50mpg
  • Results indicate real-world fuel economy
Words ByEd Callow

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What Car?'s True MPG technicians test new cars every week. However, unlike the Government figures that are generated by a laboratory test, our team's MPG numbers come after thorough test drives in real-world conditions.

This week we’re taking a look at two-door coupes. There's one petrol and five diesels, with a mixture of manual and automatic gearboxes. All beat 40mpg in our test and two models even managed more than 50mpg.

1. BMW 420d SE – officially 60.1mpg, True MPG 52.5mpg

The 4 Series is lower and wider than the 3 Series saloon, which improves the already impressive ride and handling - as long as you add the optional adaptive suspension. The 2.0-litre diesel sounds a bit gruff, but this coupe will transport four adults in comfort and it’s loaded with standard kit, including heated leather seats and xenon headlights.

2. Mercedes E220 CDI Coupe AMG Sport – officially 58.9mpg, True MPG 49.7mpg

Tempted by the latest E-Class Coupe? We’d recommend going for this version as AMG Sport models have overly firm suspension. You won’t be short-changed on equipment, either; SE cars get an online sat-nav system, DAB radio and a system that helps you park by controlling all the steering inputs.

  1. BMW 640d Coupe M Sport – officially 51.4mpg, True MPG 45.2mpg

The 6 Series Coupe is fast, refined and - in this pick-of-the-range spec - efficient. While the rear seats are best left for children, the boot will easily accommodate a couple of suitcases or golf bags. The optional adaptive suspension doesn’t completely remove the firm edge to the low-speed ride, but this is still a great grand tourer.

4. Vauxhall Astra GTC 1.7 CDTi SRi – officially 65.7mpg, True MPG 44.5mpg

This isn’t just a three-door Astra; the GTC is wider, with a longer wheelbase and more sophisticated suspension that makes it considerably better to drive. Our favourite model is the 178bhp petrol, but this diesel will be kinder to your pocket. We’d stick with cheaper Sport trim as it includes all the equipment that most people will want.

5. Mini Coupe 1.6 Cooper S – officially 48.7mpg, True MPG 40.2mpg

The 1.6-litre turbocharged petrol engine bestows the Mini Coupe with hot-hatch levels of pace, but it won’t cost a fortune to buy or run - in fact, it’s our favourite version. The cabin is fussy and a bit disappointing to the touch, but the boot is at least big enough for a weekend away. The Mini Coupe is the only car on this list that’s strictly a two-seater, but it’s also the most fun to drive.

Visit to see the full range of cars we’ve tested, and find out what you really can expect to achieve on UK roads.