Mazda6 saloon - MPG, running costs & CO2
The Mazda6 is a big car and reasonably efficient, but no diesel or hybrid engines are available
Every car in the Mazda6 range is fitted with i-Stop technology, which cuts the engine when you're stationary in traffic to help save fuel. Higher-spec Sport models also use a system called i-ELOOP, which powers some electrics in the cabin with energy captured from the brakes. This reduces the strain on the engine and further improves fuel economy.
Combining these two technologies with a lightweight body results in fairly impressive fuel economy figures, although as of 2021 only petrol engines are offered. High-mileage drivers will be better off with a diesel rival, or a hybrid like the Toyota Camry. Not having hybrid models available will also limit the appeal of the Mazda6 to tax-conscious company-car drivers.
Mazda6 MPG & CO2
The diesel Mazda6 models both managed around 55mpg and reasonable CO2 emissions with a manual gearbox, but have been discontinued due to falling diesel sales.
The Mazda6 petrol models aren't quite as talented in this department but are still competitive with most rivals. The entry-level 143bhp 2.0-litre manages 42.2mpg and emits 152g/km of CO2 with a manual gearbox (and slightly worse fuel economy with an automatic), while the 163bhp version also claims 42.2mpg and is only available with a manual gearbox. Plump for the more powerful 2.5-litre and the impact on fuel economy isn't as drastic as you might imagine, with 38.2mpg possible, along with CO2 emissions of 167g/km.
Mazda says its petrol engines come closer to matching their official fuel-economy figures in the real world than those in many other cars, thanks to being larger and not having to work as hard as smaller, turbocharged engines. However, you may find the lack of turbocharging means they need to be revved harder, which’ll affect how much fuel you use.
The limited engine range means there are no super-low insurance ratings for the Mazda6, but a spread between groups 18-23 is pretty reasonable. For example, the top-spec Skoda Superb powered by a 2.0-litre diesel falls into group 26, compared to group 26 for the most powerful Mazda6 2.5-litre GT Sport.
The three-year/60,000-mile warranty on the Mazda6 is competitive with most rivals, but brands like Hyundai, Toyota and Kia all offer more cover at no extra cost.
A trip to the dealership is needed every 12 months or 12,500 miles. While this 12-month schedule is in line with rival cars, the mileage limit is on the short side compared to some models that can cover 20,000 miles between services.
Sport versions come with 19-inch alloy wheels as standard, and these need bigger and more expensive tyres. They’re also relatively easy to damage, so you need to take extra care when parking beside a low kerb or in multi-storey car parks. Mazda offers fixed-price servicing, which costs from as little as £500.