It has been historically very rare to see a direct replacement for a modern car emerge onto the market with poorer claimed CO2 emissions than its predecessor.

Or rather, it was very rare until the past six months or so, since manufacturers have been tuning engine control systems to delivery optimal fuel economy on the road, rather than in the lab; and over which period we’ve seen similar deteriorations in lab test NEDC emissions, old model to new, from several manufacturers.

Nic Cackett

Nic Cackett

Road tester
Beating VW and BMW from a lower starting price is a result; should make the CX-5 appealing on monthly finance

So what’s the story behind this 2.2D’s increase in CO2 emissions? We suspect there is no sinister reason, merely that the new car’s engine is tuned differently to its predecessor’s.

And our test results seem to back up that conclusion: in our real-world testing, the CX-5 exceeded 50mpg on our touring economy test route and also bettered the equivalent result of a like-for-like Tiguan (53.9mpg was achieved by the Mazda versus 51.6mpg by the Volkswagen).

The Mazda is also well equipped, competitively priced and looks set to command excellent residual values, which should also make monthly finance deals look more appealing.

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