Mazda continues to follow its own path when it comes to how it powers its cars. After diesel versions were confirmed at the UK launch last summer, Mazda has added brand-new six-cylinder e-Skyactiv D diesel engines to the CX-60. 

At the international launch for these diesel models, we got to try the entry-level 200hp version, which is two-wheel drive. Choose the most powerful 254hp version, and that benefits from four-wheel drive. In 200hp form, the Skyactiv D 3.3-litre six-cylinder petrol is combined with a 48 mild-hybrid system and driven by a new eight-speed automatic transmission, designed by Mazda in-house. Unusually, it has a pair of wet clutches rather than the usual torque convertor.  

According to Mazda, a larger six-cylinder diesel is cleaner and more efficient in an SUV of the CX-60's size than a smaller one. On top of the engine size, the CX-60's Skyactiv diesel also benefits from the fitment of a unusual piston design and fuel injection technology called DCPCI (Distribution-Controlled Partially Premixed Compressed Ignition). This cleverly offsets the impact of this engine's size and friction, keeping the engine in a closely controlled, lean-burn state for longer.  

The result, according to Heiko Strietzel, manager of powertrain development, is an engine that can operate at better than 40% thermal efficiency much of the time. We saw a 56.49mpg figure attained on the test route, almost identical to the 56.5mpg official figure and I wasn't driving like a saint! The 129g/km CO2 figure for this Mazda seems low considering the engine size, too. However, the 30% BIK figure will be far harder to stomach for company car drivers.

The 200hp CX-60 diesel will only be available in the UK in Exclusive-Line spec, with the 250hp version adding Homura and range-topping Takumi versions. Exclusive-Line is the entry-level CX-60 trim, although it still includes niceties such as leather trim and a head-up display. Mazda told us that it expects just 13% of CX-60 diesel customers to choose the 197hp model.

This CX-60 diesel feels torquey enough with 450Nm - especially low-down the rev range - but it doesn't feel that fast, especially when starting off. 0-62mph acceleration comes in 8.6 seconds. 'Sport' mode doesn't seem to make much difference either - although the throttle is more sensitive. The six-cylinder soundtrack is great though.

On the road, the diesel is the best CX-60 to drive. The steering remains precise, the CX-60 is a tidy handler and grip is still good. However, there is none of the float of the hybrid, plus a more comfortable and composed ride.  

The brakes too, are much easier to modulate. But we experienced noticeable drivetrain shunt, as the clever new eight-speed gearbox de-clutched itself at speed. 

Overall though, the CX-60 diesel's efficiency impresses, but we think its BIK figure and the general stigmatisation towards diesel power for company vehicles will make this Mazda a tough sell in the UK.