Parkers overall rating: 4.1 out of 5 4.1

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

Petrol engines 7.1 - 10.2 mpp
Diesel engines 10.8 - 15.0 mpp
Plug-in hybrid petrol engines 54.8 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 53.3 - 74.3 mpg
Plug-in hybrid petrol engines 256.8 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

If you’re after the best fuel economy from your A-Class then the A 180 d is the one to go for. Capable of up to a combined 62.8mpg, it outdoes both its petrol equivalents. The A 200 d returns up to 58.9mpg, while the A 220 d claims up to 57.7mpg. For the petrols, the A 180 and A 200 return up to 47.9mpg for the manual and auto. 

The on-paper superstar is the A 250 e, which delivers 258.3mpg in official testing. For this is true when the hybrid battery pack is charged up, this will drop to a more realistic 45mpg once it's depleted. Bear that in mind if you're a long-distance driver.

It’s worth noting that claimed fuel economy figures fluctuate slightly depending on alloy wheel size (below), meaning an A 180 d on 16-inch alloys claims higher fuel economy than the same engine on 17-inchers. This is a theme across the A-Class range - the larger the wheels, the lower the fuel economy figure is by 2-3mpg on average.

The Mercedes-AMG A 35 has a claimed 35.8mpg, which isn’t bad considering the power available and all-wheel drive system. During our time of testing, we averaged 33.6mpg over a mixture of roads, including motorways and London traffic, with a peak figure of 36.2mpg after a motorway run. Fuel tank capacity is 51 litres.

Fuel consumption for each version on the largest wheels:

  • A 180 – 54.3mpg (manual or auto)
  • A 200 – 54.3mpg (manual or auto)
  • A 250 – 47.9mpg (auto only)
  • A 250e – 217.3mpg
  • A 180 d – 70.6mpg (manual)
  • A 180 d auto – 74.3mpg
  • A 200 d auto – 68.9mpg
  • A 220 d auto – 68.9mpg

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

In regards to CO2 emissions, the cleanest option in the petrol line-up is the A 180 automatic, producing 119g/km when fitted with the smallest wheels. The maximum this engine could produce is 129g/km for a manual version with larger wheels fitted. The A 200 emits between 123 and 136g/km, while the A 220 produces 141g/km in front-wheel drive form and 148g/km in 4Matic guise. The A 250 emits 141g/km, with the AMG A 35 bringing up the rear (unsurprisingly) with 169g/km.

The diesels claim far better figures than the petrols. The A 180 d emits 108-11g/km, the A 200 d 110g/km and the A 220 d 114g/km, making these the appealing options for tax. However the A 250 e is by far the overall winner with an impressive (on paper) 31g/km – while there's charge in the battery pack.

Reliability

  • Hard to gauge reliability at this early stage
  • Previous-generation A-Class had a few minor recalls
  • Plenty of advanced kit, which could be costly to fix

The previous-generation car had a number of recalls throughout its production run, although none serious or frequent enough to cause major alarm. But the reliability record of this car was far from exemplary – but the good news is the improved quality of the current version is, so far, resulting in improved reliability.

It will be worth keeping an eye on the fancy new interior, however, with the array of high-tech components creating ample opportunity for things to go wrong. Even if they do, 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 17 - 37
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