Both the Mazda3’s petrol engines are mild hybrids, while the more powerful version also uses Mazda’s Skyactiv-X fuel-saving technology. This runs on normal petrol, but uses cutting-edge technology to operate in a more efficient way; closer in principle to a diesel engine, is the simple summation. The upshot is that it’s impressively economical for a 2.0-litre petrol engine, with an official fuel consumption figure of up to 54.3mpg in manual hatchback form, while the saloon is better still at up to 56.5mpg.
The lower-powered e-Skyactiv-G engine can’t quite match those figures, but it’s still more economical than most of its petrol rivals, with an official figure of up to 51.4mpg. As always, we’d treat these laboratory figures with a pinch of salt, but experience has shown that the Skyactiv engines tend to fare better than most when it comes to the real world.