Real-world MPG: most economical coupes

Coupe's can be stylish, practical and economical. These two-door models all exceed 45mpg in our real-world True MPG tests...

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Darren Moss
7 Mar 2016 9:50 | Last updated: 14 Jun 2018 0:3

What Car?’s technicians drive new cars every week to capture our True MPG fuel economy data. Unlike official Government figures generated by laboratory tests, the numbers we publish are gained from real-world conditions.

This week we’re taking a look at the most economical two-door coupes we’ve tested so far. There’s a mixture of manual and automatic gearboxes, but all six are diesel-powered. These cars are stylish and efficient, and all beat 45mpg in our test.

1. BMW 220d Coupe – official 62.8mpg, True MPG 55.8mpg

The most efficient coupe in this round-up is also one of the smallest. The new 2 Series has plenty of space for two adults in the front, but there’s really not much room in the back. In 220d SE guise it has plenty of power and equipment, although the engine is very grumbly at low speeds. If you can live with that, and treat it as a two-seater, this coupe is classy, comfortable and fun to drive.

2. Audi A5 2.0 TDI Ultra – official 67.3mpg, True MPG 51.6mpg

Audi only offers the A5 2.0 TDI Ultra in SE trim with a manual gearbox. Luckily the SE is generously equipped, with Bluetooth, multi-zone climate control and heated leather seats as standard. The only option we'd recommend is the £1695 Technology Pack, which adds a sat-nav. The A5 is refined, but some drivers may find the off-set pedals uncomfortable.

3. Audi TT 2.0 TDI Sport Ultra – official 67.3mpg, True MPG 50.9mpg

Audi's latest TT is one of the best coupes around. In fact, we named it our coupe of the year in the 2016 What Car? Awards. It's well equipped, comfortable over long distances and comes with Audi's all-digital Virtual Cockpit display system. We found this TT can manage 44.9mpg in town, rising to 56.9mpg on the motorway.

4. Mercedes-Benz E220 CDI Coupe – official 58.9mpg, True MPG 49.7mpg

We’d recommend going for the E220 in entry-level SE trim, as AMG Sport models have suspension that is slightly too firm. You won’t be shortchanged 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.

5. BMW 420d Gran Coupe SE xDrive – official 57.6mpg, True MPG 48.9mpg

The BMW 4 Series is enjoyable to drive and, unlike some coupes, it has enough space for four adults. It also has a large boot. Although undeniably classy, refinement from its 2.0-litre diesel engine could be better, and its interior is almost identical to that of the 3 Series saloon.

6. BMW 640d Coupe – official 51.4mpg, True MPG 45.2mpg

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

We add new models to our True MPG database every week. Visit to see the full range of cars we’ve tested, and find out what you can really expect your car to achieve on UK roads.