Parkers overall rating: 3.9 out of 5 3.9

Miles per pound (mpp) Miles per pound (mpp)

Petrol engines 7.1 - 10.2 mpp
Diesel engines 10.6 - 13.0 mpp
Plug-in hybrid petrol engines 54.8 - 60.3 mpp
Low figures relate to the least economical version; high to the most economical. Based on WLTP combined fuel economy for versions of this car made since September 2017 only, and typical current fuel or electricity costs.
Based on "Weighted" mpg; figures depend on the proportion of miles driven in pure electric mode and may vary widely

Fuel economy

Petrol engines 33.2 - 47.9 mpg
Diesel engines 52.3 - 64.2 mpg
Plug-in hybrid petrol engines 256.8 - 282.5 mpg
  • Opt for the A 180 d for the best fuel economy
  • A 200 petrol should maintain value well
  • Hybrid A 250 e has great battery-only range

At the time of writing (August 2020), if you're looking for the most fuel-efficient conventional version of the A-Class it's the A 180 d, which claims to be capable of 60.1-62.8mpg according to the official WLTP standard.. The A 200 d returns a claimed 56.5-57.7mpg, while the A 220 d claims 55.4mpg.

Much of this is influenced by how and where you drive, however, as we've seen 70mpg from the A 220 d on longer motorway journeys. WLTP does seem to be a reasonably accurate indicator of what you can get.

For the petrols, the A 180 and A 200 return up to 47.9mpg when fitted with the manual gearbox, 47.1mpg with the automatic transmission.

The on-paper superstar is the A 250 e, which claims 256.8-282.5mpg in official testing. Crazy figures, which only make sense if you do plenty of journeys under battery power alone. Over longer distances, around 45mpg is a more realistic figure.

The official figures vary with specification, influenced by the weight of the fitted equipment and the size of the alloy wheels - the bigger the wheels, the more fuel the car will drink. This is true of any vehicle, though.

The Mercedes-AMG A 35 performance model claims 33.2-34.9mpg,  which isn’t bad considering the power available and all-wheel drive system. We averaged 33.6mpg over a mixture of roads, including motorways and London traffic while testing, with a peak figure of 36.2mpg after a motorway run.

Fuel tank capacity is 51 litres.

Mercedes A-Class CO2 emissions

With regards to CO2 emissions, the cleanest option in the petrol line-up is the A 180 automatic, producing 134g/km when fitted with the smallest wheels and the manual gearbox. The equivalent A 200 emits 135g/km, while the A 250 emits 156g/km, and the AMG A 35 a minimum of 184g/km.

As for the diesels, the A 180 d emits as little as 120g/km, the A 200 d 129g/km and the A 220 d 133g/km, making these the more appealing options when it comes to company car tax (Benefit-in-Kind).

However the A 250 e has by far the lowest CO2 emissions (again, on paper), with an official figure as low as 23g/km.

Again, the exact CO2 figure will vary with trim level, standard equipment and wheel size.

Mercedes A-Class service intervals

Servicing intervals for the A-Class are every 12 months or 15,500 miles – whichever comes sooner. A range of service packs are available, and can be passed on if the vehicle is sold to a new owner.

Reliability

  • No sign of major reliability issues yet
  • Previous-generation A-Class had a few minor recalls
  • Plenty of advanced kit, which could be costly to fix

The previous-generation A-Class had a number of recalls throughout its production run, although none serious or frequent enough to cause major alarm. Even so, the reliability record of this car was far from exemplary – and the good news is the improved quality of the current version is, so far, resulting in improved reliability. We've heard of no major horror stories at all yet - though do let us know via the Parkers feedback email address if you have experienced issues.

It will be worth keeping an eye on the fancy interior as time goes on, however, as the array of high-tech components offering plenty of potential for things to go wrong.

Every new A-Class comes with a comprehensive three-year, unlimited mileage warranty from the manufacturer, along with three years roadside assistance.

Ongoing running costs

Road tax (12 months) £140 - £475
Insurance group 15 - 37
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