In Mazdas, other than smoothing the torque curve, they also run the car's electrical systems. According to their own data, the newer version of the 2.0 SA-G engine (in the latest Mazda3 and CX-30), whilst still 120PS, is actually slower to 60 (and by some margin - 1.5 sec) than the one fitted to the gen-3 Mazda3 and (dropped) CX-3.
AFAIK, he only material difference that the owner sees is the addition of the mild hybrid system (it *may* have a PPF - not sure) and a bit better real-world mpg / emissions when meeting the newer testing regime. The 'headline figures' on that score, especially on CO2 emissions, aren't any different. Particulates may be a vastly different story, but getting data on that is more tricky.
Whilst the new gen cars are better looking, they are quite a bit more expensive. Not so good to get a slower car unless you shell out an extra £3k - £5k for a SA-X engine.
It's not as though owners are benefitting financially from the (real) lower emissions - in fact, some will pay £35 - £40 more pa (VED) for the 'priviledge' in addition to the much higher list prices compared to pre-March 2017 models.
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