"Some of the models tested emitted as much as 10 times more than the standard allowed for despite the absence of any illegal tampering software."
They mean because of, not despite, shorely? :-)
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Interestingly the Mazda diesel engines have a low 14:1 compression ratio - this is apparently good for NOx emissions.
Their N/A petrol engine has a very high 14:1 compression ratio also, good for fuel efficiency.
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