In both the Fortwo and Forfour, two engines are available, both rear-mounted and driving the rear axle. The powerplants are Renault sourced, as the French firm’s new Twingo is derived from the same technical underpinnings as the Forfour.
The base unit is a 999cc, three-cylinder naturally aspirated petrol engine. It produces maximum power of 70bhp at 6000rpm and peak torque of 67lb ft at 2850rpm.
Equipped with this engine, the Smart Fortwo can accelerate from 0-62mph in 14.4sec and hit a top speed of 94mph. Smart claims fuel economy of 68.9mpg and CO2 emissions of 93g/km.
The more powerful engine is a turbocharged 898cc, three-cylinder unit that develops 89bhp at 5500rpm and 100lb ft of torque at 2500rpm. Combined economy for the Smart Fortwo with this powerplant is put at 67.3mpg and 97g/km of CO2. It can cover the 0-62mph sprint in 10.4sec and reach 96mph.
The Smart Forfour weighs 95kg more than its compact sibling. Equipped with the naturally aspirated engine, the four-seater can achieve 67.3mpg on the combined cycle and emits 97g/km of CO2. From rest, it accelerates to 62mph in 15.9sec on its way to a top speed of 94mph.
The Forfour includes rear doors that open to an 85-degree angle, a rear bench that folds flat into the floor, leaving a 975-litre load space and the ability to carry items measuring up to 2.2-metres in length.