Parkers overall rating: 4.3 out of 5 4.3

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

Petrol engines 8.2 - 9.0 mpp
Diesel engines 9.7 - 11.2 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.

Fuel economy

Petrol engines 38.2 - 42.2 mpg
Diesel engines 47.9 - 55.4 mpg
  • Lots of standard equipment
  • Fantastic value PCP finance
  • Petrols should offer good real-world economy

The 6 comes with no hybrid or electric powertrains, though Mazda has set the car up to give good real-world mpg. This means that while the claimed economy figures aren’t as high as with some rivals, you should be able to get closer to these figures than rivals with more ambitious figures.

Most economical on paper is the 150hp 2.2-litre diesel, which offers the prospect of 55.4mpg in manual form. If you want an automatic gearbox with this engine, you'll have to seek a used example.

The 184hp diesel, however, is capable of 53.3mpg with a manual gearbox, though this falls to 47.9mpg with the automatic option.

Of the petrols, it’s the least powerful 145hp model which offers the best official mpg figure standing at 42.2mpg with the manual gearbox and 40.4mpg for the automatic gearbox. The larger petrol engine isn’t far behind, however, with even the most powerful 194hp version still returning 38.2mpg.

Fuel tank capacity is 62 litres.

To get the lowest Mazda 6 running costs, all bar the highest mileage drivers are likely to be better off with a petrol model, as you could easily see a £100 per month saving on PCP finance for choosing a petrol over the diesel equivalent. This is due to the diesel versions costing more upfront and are expected to lose value quicker due to questions over the environmental impact of some diesels.

When it comes to CO2 emissions, the Mazda 6 doesn't stand out above the rest, but should be more representative than with many other models, according to the manufacturer.

The 2.0-litre 145hp petrol ranges from 152-159g/km, depending on which gearbox is fitted, with the 2.5-litre rising up to 167g/km.

The lower-powered 2.2-litre diesel starts at 137g/km, while the higher-powered 184hp version ranging from 140-152g - again, depending on the choice of gearbox.

Thankfully it won’t cost you an arm and a leg to get your Mazda maintained because the dealerships offer low servicing costs.

Reliability

  • Only a couple of recalls issued
  • Mostly minor faults reported
  • Few reasons for concern

Mazda has issued a few recalls for this generation of 6, with two in 2019 relating to engine valves, but there should be few safety issues to worry about. Unfortunately, reliability has been a bit of a mixed bag for the 6 Saloon in this generation in our owners' reviews. There have been reports of electrical gremlins Mazda has been unable to fix, along with reported issues with engine and exhaust components.

As always, for the best chance of avoiding any issues it’s worth keeping your car regularly serviced if buying new and making sure to buy a well looked after car if you’re purchasing a used model.

Read how we got on with living with a Mazda 6 Tourer for a year and 18,000 miles

Ongoing running costs

Road tax (12 months) £20 - £150
See tax rates for all versions
Insurance group 16 - 31
How much is it to insure?