B-SERIES Bravos come with the choice of two engines across the majority of the range the 2.6-litre four-cylinder petrol and the 2.5-litre four-cylinder turbo-diesel with intercooler. Both use alloy cylinder-heads. The test vehicle ran the petrol engine, which develops 92kW of power at 4600rpm and 206Nm of torque at 3500rpm. This engine has changed little in the past 10 years - in fact Mazda has only increased the torque by one Newton metre and the engine capacity by one cubic centimetre in all that time. This suggests that in Mazda's eyes - if it ain't broke, don't fix it! The engine breathes via a set of 12 valves, driven from a single overhead camshaft, using two valves for intake and one for exhaust. The timing chain is self-adjusting and no scheduled change is required. The engine revs to a safe 5500rpm but gearshifts are generally made between 3500rpm and 4000rpm, where maximum torque is produced. Mazda has made the 2.6-litre petrol engine gas compatible and offers a factory-fitted system as an option, with full factory warranty. The air inlet housing is pre-cast to take the dual fuel fittings, so little has to change on this engine to be ready to accept the cheaper fuel. Official fuel (ULP) economy figure for the petrol engine is 13.0L/100km on a city cycle. The fuel tank capacity is 70 litres with the average fill-up from empty on the gauge at 60 litres. Mazda recommends engine and vehicle service intervals of 10,000km.