Very fuel-efficient. The Mazda3 1.5 has an official combined fuel consumption of 17.0 km/L, with real-world city driving around 13-15 km/L and highway driving reaching 18-20 km/L. The 2.0 version has a combined fuel consumption of approximately 16.1 km/L, also impressive. For a daily commuter, the Mazda3's fuel efficiency is excellent.